src/main/event.c

   1 /*
   2  * event.c      Server event handling
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29 #include <freeradius-devel/event.h>
  30 #include <freeradius-devel/detail.h>
  31
  32 #include <freeradius-devel/rad_assert.h>
  33
  34 #include <signal.h>
  35 #include <fcntl.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #       include <sys/wait.h>
  39 #endif
  40
  41 #define USEC (1000000)
  42
  43 extern pid_t radius_pid;
  44 extern int dont_fork;
  45 extern int check_config;
  46 extern void force_log_reopen(void);
  47 extern char *debug_condition;
  48
  49 /*
  50  *      Ridiculous amounts of local state.
  51  */
  52 static fr_event_list_t  *el = NULL;
  53 static fr_packet_list_t *pl = NULL;
  54 static int                      request_num_counter = 0;
  55 static struct timeval           now;
  56 time_t                          fr_start_time;
  57 static int                      have_children;
  58 static int                      just_started = TRUE;
  59
  60 #ifndef __MINGW32__
  61 #ifdef HAVE_PTHREAD_H
  62 #define WITH_SELF_PIPE (1)
  63 #endif
  64 #endif
  65
  66 #ifdef WITH_SELF_PIPE
  67 static int self_pipe[2];
  68 #endif
  69
  70 #ifdef HAVE_PTHREAD_H
  71 #ifdef WITH_PROXY
  72 static pthread_mutex_t  proxy_mutex;
  73 #endif
  74
  75 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  76 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  77
  78 static pthread_t NO_SUCH_CHILD_PID;
  79 #else
  80 /*
  81  *      This is easier than ifdef's throughout the code.
  82  */
  83 #define PTHREAD_MUTEX_LOCK(_x)
  84 #define PTHREAD_MUTEX_UNLOCK(_x)
  85 int thread_pool_addrequest(REQUEST *request, RAD_REQUEST_FUNP fun)
  86 {
  87         radius_handle_request(request, fun);
  88         return 1;
  89 }
  90 #endif
  91
  92 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
  93
  94 #ifdef WITH_PROXY
  95 static fr_packet_list_t *proxy_list = NULL;
  96
  97 /*
  98  *      We keep the proxy FD's here.  The RADIUS Id's are marked
  99  *      "allocated" per Id, via a bit per proxy FD.
 100  */
 101 static int              proxy_fds[32];
 102 static rad_listen_t     *proxy_listeners[32];
 103 #else
 104 #define remove_from_proxy_hash(foo)
 105 #endif
 106
 107 static void request_post_handler(REQUEST *request);
 108 static void wait_a_bit(void *ctx);
 109 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
 110 #ifdef WITH_DETAIL
 111 static void event_poll_detail(void *ctx);
 112 #endif
 113
 114 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
 115                                     const char *msg)
 116 {
 117         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
 118         _exit(1);
 119 }
 120
 121 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 122
 123
 124 static void tv_add(struct timeval *tv, int usec_delay)
 125 {
 126         if (usec_delay > USEC) {
 127                 tv->tv_sec += usec_delay / USEC;
 128                 usec_delay %= USEC;
 129         }
 130         tv->tv_usec += usec_delay;
 131
 132         if (tv->tv_usec > USEC) {
 133                 tv->tv_usec -= USEC;
 134                 tv->tv_sec++;
 135         }
 136 }
 137
 138 static void remove_from_request_hash(REQUEST *request)
 139 {
 140         if (!request->in_request_hash) return;
 141
 142         fr_packet_list_yank(pl, request->packet);
 143         request->in_request_hash = FALSE;
 144
 145         request_stats_final(request);
 146 }
 147
 148
 149 #ifdef WITH_PROXY
 150 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 151 {
 152         RADIUS_PACKET **proxy_p;
 153         REQUEST *request;
 154
 155         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 156         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 157
 158         if (!proxy_p) {
 159                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 160                 return NULL;
 161         }
 162
 163         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 164
 165         if (!request) {
 166                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 167                 return NULL;
 168         }
 169
 170         request->num_proxied_responses++;
 171
 172         /*
 173          *      Catch the most common case of everything working
 174          *      correctly.
 175          */
 176         if (request->num_proxied_requests == request->num_proxied_responses) {
 177                 fr_packet_list_yank(proxy_list, request->proxy);
 178                 fr_packet_list_id_free(proxy_list, request->proxy);
 179                 request->in_proxy_hash = FALSE;
 180         }
 181
 182         /*
 183          *      On the FIRST reply, decrement the count of outstanding
 184          *      requests.  Note that this is NOT the count of sent
 185          *      packets, but whether or not the home server has
 186          *      responded at all.
 187          */
 188         if (!request->proxy_reply &&
 189             request->home_server &&
 190             request->home_server->currently_outstanding) {
 191                 request->home_server->currently_outstanding--;
 192         }
 193
 194         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 195
 196         return request;
 197 }
 198
 199
 200 static void remove_from_proxy_hash(REQUEST *request)
 201 {
 202         /*
 203          *      Check this without grabbing the mutex because it's a
 204          *      lot faster that way.
 205          */
 206         if (!request->in_proxy_hash) return;
 207
 208         /*
 209          *      The "not in hash" flag is definitive.  However, if the
 210          *      flag says that it IS in the hash, there might still be
 211          *      a race condition where it isn't.
 212          */
 213         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 214
 215         if (!request->in_proxy_hash) {
 216                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 217                 return;
 218         }
 219
 220         fr_packet_list_yank(proxy_list, request->proxy);
 221         fr_packet_list_id_free(proxy_list, request->proxy);
 222
 223         /*
 224          *      The home server hasn't replied, but we've given up on
 225          *      this request.  Don't count this request against the
 226          *      home server.
 227          */
 228         if (!request->proxy_reply &&
 229             request->home_server &&
 230             request->home_server->currently_outstanding) {
 231                 request->home_server->currently_outstanding--;
 232         }
 233
 234         /*
 235          *      Got from YES in hash, to NO, not in hash while we hold
 236          *      the mutex.  This guarantees that when another thread
 237          *      grans the mutex, the "not in hash" flag is correct.
 238          */
 239         request->in_proxy_hash = FALSE;
 240
 241         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 242 }
 243
 244 static void ev_request_free(REQUEST **prequest)
 245 {
 246         REQUEST *request;
 247
 248         if (!prequest || !*prequest) return;
 249
 250         request = *prequest;
 251
 252 #ifdef WITH_COA
 253         if (request->coa) {
 254                 /*
 255                  *      Divorce the child from the parent first,
 256                  *      then clean up the child.
 257                  */
 258                 request->coa->parent = NULL;
 259                 ev_request_free(&request->coa);
 260         }
 261
 262         /*
 263          *      Divorce the parent from the child, and leave the
 264          *      parent still alive.
 265          */
 266         if (request->parent && (request->parent->coa == request)) {
 267                 request->parent->coa = NULL;
 268         }
 269 #endif
 270
 271         if (request->ev) fr_event_delete(el, &request->ev);
 272         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 273         if (request->in_request_hash) remove_from_request_hash(request);
 274
 275         request_free(prequest);
 276 }
 277
 278 static int proxy_id_alloc(REQUEST *request, RADIUS_PACKET *packet)
 279 {
 280         int i, proxy, found;
 281         rad_listen_t *proxy_listener;
 282
 283         if (fr_packet_list_id_alloc(proxy_list, packet)) return 1;
 284
 285         /*
 286          *      Allocate a new proxy fd.  This function adds
 287          *      it to the tail of the list of listeners.  With
 288          *      some care, this can be thread-safe.
 289          */
 290         proxy_listener = proxy_new_listener(&packet->src_ipaddr, FALSE);
 291         if (!proxy_listener) {
 292                 RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 293                 return 0;
 294         }
 295
 296         /*
 297          *      Cache it locally.
 298          */
 299         found = -1;
 300         proxy = proxy_listener->fd;
 301         for (i = 0; i < 32; i++) {
 302                 /*
 303                  *      Found a free entry.  Save the socket,
 304                  *      and remember where we saved it.
 305                  */
 306                 if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 307                         found = (proxy + i) & 0x1f;
 308                         proxy_fds[found] = proxy;
 309                         proxy_listeners[found] = proxy_listener;
 310                         break;
 311                 }
 312         }
 313         rad_assert(found >= 0);
 314
 315         if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 316                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 317                 return 0;
 318
 319         }
 320
 321         if (!fr_packet_list_id_alloc(proxy_list, packet)) {
 322                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 323                 return 0;
 324         }
 325
 326         /*
 327          *      Signal the main thread to add the new FD to the list
 328          *      of listening FD's.
 329          */
 330         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 331         return 1;
 332 }
 333
 334
 335 static int insert_into_proxy_hash(REQUEST *request, int retransmit)
 336 {
 337         int i, proxy;
 338         char buf[128];
 339
 340         rad_assert(request->proxy != NULL);
 341         rad_assert(proxy_list != NULL);
 342
 343         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 344
 345         /*
 346          *      Keep track of maximum outstanding requests to a
 347          *      particular home server.  'max_outstanding' is
 348          *      enforced in home_server_ldb(), in realms.c.
 349          */
 350         if (request->home_server) {
 351                 request->home_server->currently_outstanding++;
 352         }
 353
 354         if (retransmit) {
 355                 RADIUS_PACKET packet;
 356
 357                 packet = *request->proxy;
 358
 359                 if (!proxy_id_alloc(request, &packet)) {
 360                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 361                         return 0;
 362                 }
 363
 364                 /*
 365                  *      Yank the request, free the old Id, and
 366                  *      remember the new Id.
 367                  */
 368                 fr_packet_list_yank(proxy_list, request->proxy);
 369                 fr_packet_list_id_free(proxy_list, request->proxy);
 370                 *request->proxy = packet;
 371
 372         } else if (!proxy_id_alloc(request, request->proxy)) {
 373                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 374                 return 0;
 375         }
 376
 377         rad_assert(request->proxy->sockfd >= 0);
 378
 379         /*
 380          *      FIXME: Hack until we get rid of rad_listen_t, and put
 381          *      the information into the packet_list.
 382          */
 383         proxy = -1;
 384         for (i = 0; i < 32; i++) {
 385                 if (proxy_fds[i] == request->proxy->sockfd) {
 386                         proxy = i;
 387                         break;
 388                 }
 389         }
 390
 391         if (proxy < 0) {
 392                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 393                 RDEBUG2("ERROR: All sockets are full.");
 394                 return 0;
 395         }
 396
 397         rad_assert(proxy_fds[proxy] != -1);
 398         rad_assert(proxy_listeners[proxy] != NULL);
 399         request->proxy_listener = proxy_listeners[proxy];
 400
 401         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 402                 fr_packet_list_id_free(proxy_list, request->proxy);
 403                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 404                 RDEBUG2("ERROR: Failed to insert entry into proxy list");
 405                 return 0;
 406         }
 407
 408         request->in_proxy_hash = TRUE;
 409
 410         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 411
 412         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 413                inet_ntop(request->proxy->dst_ipaddr.af,
 414                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 415                request->proxy->dst_port,
 416                request->proxy->id);
 417
 418         return 1;
 419 }
 420
 421
 422 /*
 423  *      Called as BOTH an event, and in-line from other functions.
 424  */
 425 static void wait_for_proxy_id_to_expire(void *ctx)
 426 {
 427         REQUEST *request = ctx;
 428
 429         rad_assert(request->magic == REQUEST_MAGIC);
 430         rad_assert(request->proxy != NULL);
 431
 432         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 433         request->when = request->proxy_when;
 434
 435 #ifdef WITH_COA
 436         if (((request->proxy->code == PW_COA_REQUEST) ||
 437              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 438             (request->packet->code != request->proxy->code)) {
 439                 request->when.tv_sec += request->home_server->coa_mrd;
 440         } else
 441 #endif
 442         request->when.tv_sec += request->home_server->response_window;
 443
 444         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 445             timercmp(&now, &request->when, >)) {
 446                 if (request->packet) {
 447                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 448                                request->number, request->packet->id,
 449                                (unsigned int) (request->timestamp - fr_start_time));
 450                 } else {
 451                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 452                                request->number,
 453                                (unsigned int) (request->timestamp - fr_start_time));
 454                 }
 455
 456                 ev_request_free(&request);
 457                 return;
 458         }
 459
 460         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 461 }
 462 #endif
 463
 464 #ifdef HAVE_PTHREAD_H
 465 static void wait_for_child_to_die(void *ctx)
 466 {
 467         REQUEST *request = ctx;
 468
 469         rad_assert(request->magic == REQUEST_MAGIC);
 470
 471         if ((request->child_state == REQUEST_QUEUED) |
 472             (request->child_state == REQUEST_RUNNING)) {
 473                 request->delay += (request->delay >> 1);
 474                 tv_add(&request->when, request->delay);
 475
 476                 RDEBUG2("Child is still stuck for request %d", request->number);
 477
 478                 INSERT_EVENT(wait_for_child_to_die, request);
 479                 return;
 480         }
 481
 482         RDEBUG2("Child is finally responsive for request %d", request->number);
 483         remove_from_request_hash(request);
 484
 485 #ifdef WITH_PROXY
 486         if (request->proxy) {
 487                 wait_for_proxy_id_to_expire(request);
 488                 return;
 489         }
 490 #endif
 491
 492         ev_request_free(&request);
 493 }
 494 #endif
 495
 496 static void cleanup_delay(void *ctx)
 497 {
 498         REQUEST *request = ctx;
 499
 500         rad_assert(request->magic == REQUEST_MAGIC);
 501         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 502                    (request->child_state == REQUEST_DONE));
 503
 504         remove_from_request_hash(request);
 505
 506 #ifdef WITH_PROXY
 507         if (request->proxy && request->in_proxy_hash) {
 508                 wait_for_proxy_id_to_expire(request);
 509                 return;
 510         }
 511 #endif
 512
 513         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 514                request->number, request->packet->id,
 515                (unsigned int) (request->timestamp - fr_start_time));
 516
 517         ev_request_free(&request);
 518 }
 519
 520
 521 /*
 522  *      FIXME: Put into a libradius function.
 523  */
 524 #define MAX_PACKET_CODE (52)
 525 static const char *packet_codes[] = {
 526   "",
 527   "Access-Request",
 528   "Access-Accept",
 529   "Access-Reject",
 530   "Accounting-Request",
 531   "Accounting-Response",
 532   "Accounting-Status",
 533   "Password-Request",
 534   "Password-Accept",
 535   "Password-Reject",
 536   "Accounting-Message",
 537   "Access-Challenge",
 538   "Status-Server",
 539   "Status-Client",
 540   "14",
 541   "15",
 542   "16",
 543   "17",
 544   "18",
 545   "19",
 546   "20",
 547   "Resource-Free-Request",
 548   "Resource-Free-Response",
 549   "Resource-Query-Request",
 550   "Resource-Query-Response",
 551   "Alternate-Resource-Reclaim-Request",
 552   "NAS-Reboot-Request",
 553   "NAS-Reboot-Response",
 554   "28",
 555   "Next-Passcode",
 556   "New-Pin",
 557   "Terminate-Session",
 558   "Password-Expired",
 559   "Event-Request",
 560   "Event-Response",
 561   "35",
 562   "36",
 563   "37",
 564   "38",
 565   "39",
 566   "Disconnect-Request",
 567   "Disconnect-ACK",
 568   "Disconnect-NAK",
 569   "CoA-Request",
 570   "CoA-ACK",
 571   "CoA-NAK",
 572   "46",
 573   "47",
 574   "48",
 575   "49",
 576   "IP-Address-Allocate",
 577   "IP-Address-Release"
 578 };
 579
 580
 581 /*
 582  *      In daemon mode, AND this request has debug flags set.
 583  */
 584 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 585
 586 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 587 {
 588         VALUE_PAIR *vp;
 589         char buffer[1024];
 590         const char *received, *from;
 591         const fr_ipaddr_t *ip;
 592         int port;
 593
 594         if (!packet) return;
 595
 596         rad_assert(request->radlog != NULL);
 597
 598         if (direction == 0) {
 599                 received = "Received";
 600                 from = "from";  /* what else? */
 601                 ip = &packet->src_ipaddr;
 602                 port = packet->src_port;
 603
 604         } else {
 605                 received = "Sending";
 606                 from = "to";    /* hah! */
 607                 ip = &packet->dst_ipaddr;
 608                 port = packet->dst_port;
 609         }
 610
 611         /*
 612          *      Client-specific debugging re-prints the input
 613          *      packet into the client log.
 614          *
 615          *      This really belongs in a utility library
 616          */
 617         if ((packet->code > 0) && (packet->code < MAX_PACKET_CODE)) {
 618                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 619                        received, packet_codes[packet->code], from,
 620                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 621                        port, packet->id, packet->data_len);
 622         } else {
 623                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 624                        received, from,
 625                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 626                        port,
 627                        packet->code, packet->id, packet->data_len);
 628         }
 629
 630         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 631                 vp_prints(buffer, sizeof(buffer), vp);
 632                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 633         }
 634 }
 635
 636 static void reject_delay(void *ctx)
 637 {
 638         REQUEST *request = ctx;
 639
 640         rad_assert(request->magic == REQUEST_MAGIC);
 641         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 642
 643         RDEBUG2("Sending delayed reject for request %d", request->number);
 644
 645         DEBUG_PACKET(request, request->reply, 1);
 646
 647         request->listener->send(request->listener, request);
 648
 649         request->when.tv_sec += request->root->cleanup_delay;
 650         request->child_state = REQUEST_CLEANUP_DELAY;
 651
 652         INSERT_EVENT(cleanup_delay, request);
 653 }
 654
 655
 656 #ifdef WITH_PROXY
 657 void revive_home_server(void *ctx)
 658 {
 659         home_server *home = ctx;
 660         char buffer[128];
 661
 662         home->state = HOME_STATE_ALIVE;
 663         home->currently_outstanding = 0;
 664         home->revive_time = now;
 665
 666         /*
 667          *      Delete any outstanding events.
 668          */
 669         if (home->ev) fr_event_delete(el, &home->ev);
 670
 671         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 672                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 673                          buffer, sizeof(buffer)),
 674                home->port);
 675
 676 }
 677
 678
 679 static void no_response_to_ping(void *ctx)
 680 {
 681         REQUEST *request = ctx;
 682         home_server *home;
 683         char buffer[128];
 684
 685         rad_assert(request->home_server != NULL);
 686
 687         home = request->home_server;
 688         home->num_received_pings = 0;
 689
 690         RDEBUG2("No response to status check %d from home server %s port %d",
 691                request->number,
 692                inet_ntop(request->proxy->dst_ipaddr.af,
 693                          &request->proxy->dst_ipaddr.ipaddr,
 694                          buffer, sizeof(buffer)),
 695                request->proxy->dst_port);
 696
 697         wait_for_proxy_id_to_expire(request);
 698 }
 699
 700
 701 static void received_response_to_ping(REQUEST *request)
 702 {
 703         home_server *home;
 704         char buffer[128];
 705
 706         rad_assert(request->home_server != NULL);
 707
 708         home = request->home_server;
 709         home->num_received_pings++;
 710
 711         RDEBUG2("Received response to status check %d (%d in current sequence)",
 712                request->number, home->num_received_pings);
 713
 714         /*
 715          *      Remove the request from any hashes
 716          */
 717         fr_event_delete(el, &request->ev);
 718         remove_from_proxy_hash(request);
 719         rad_assert(request->in_request_hash == FALSE);
 720
 721         /*
 722          *      The control socket may have marked the home server as
 723          *      alive.  OR, it may have suddenly started responding to
 724          *      requests again.  If so, don't re-do the "make alive"
 725          *      work.
 726          */
 727         if (home->state == HOME_STATE_ALIVE) return;
 728
 729         /*
 730          *      We haven't received enough ping responses to mark it
 731          *      "alive".  Wait a bit.
 732          */
 733         if (home->num_received_pings < home->num_pings_to_alive) {
 734                 return;
 735         }
 736
 737         home->state = HOME_STATE_ALIVE;
 738         home->currently_outstanding = 0;
 739         home->revive_time = now;
 740
 741         if (!fr_event_delete(el, &home->ev)) {
 742                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 743         }
 744
 745         radlog(L_INFO, "PROXY: Marking home server %s port %d alive",
 746                inet_ntop(request->proxy->dst_ipaddr.af,
 747                          &request->proxy->dst_ipaddr.ipaddr,
 748                          buffer, sizeof(buffer)),
 749                request->proxy->dst_port);
 750 }
 751
 752
 753 /*
 754  *      Called from start of zombie period, OR after control socket
 755  *      marks the home server dead.
 756  */
 757 static void ping_home_server(void *ctx)
 758 {
 759         uint32_t jitter;
 760         home_server *home = ctx;
 761         REQUEST *request;
 762         VALUE_PAIR *vp;
 763
 764         if ((home->state == HOME_STATE_ALIVE) ||
 765             (home->ping_check == HOME_PING_CHECK_NONE)) {
 766                 return;
 767         }
 768
 769         request = request_alloc();
 770         request->number = request_num_counter++;
 771
 772         request->proxy = rad_alloc(1);
 773         rad_assert(request->proxy != NULL);
 774
 775         fr_event_now(el, &request->when);
 776         home->when = request->when;
 777
 778         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 779                 request->proxy->code = PW_STATUS_SERVER;
 780
 781                 radius_pairmake(request, &request->proxy->vps,
 782                                 "Message-Authenticator", "0x00", T_OP_SET);
 783
 784         } else if (home->type == HOME_TYPE_AUTH) {
 785                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 786
 787                 radius_pairmake(request, &request->proxy->vps,
 788                                 "User-Name", home->ping_user_name, T_OP_SET);
 789                 radius_pairmake(request, &request->proxy->vps,
 790                                 "User-Password", home->ping_user_password, T_OP_SET);
 791                 radius_pairmake(request, &request->proxy->vps,
 792                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 793                 radius_pairmake(request, &request->proxy->vps,
 794                                 "Message-Authenticator", "0x00", T_OP_SET);
 795
 796         } else {
 797 #ifdef WITH_ACCOUNTING
 798                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 799
 800                 radius_pairmake(request, &request->proxy->vps,
 801                                 "User-Name", home->ping_user_name, T_OP_SET);
 802                 radius_pairmake(request, &request->proxy->vps,
 803                                 "Acct-Status-Type", "Stop", T_OP_SET);
 804                 radius_pairmake(request, &request->proxy->vps,
 805                                 "Acct-Session-Id", "00000000", T_OP_SET);
 806                 vp = radius_pairmake(request, &request->proxy->vps,
 807                                      "Event-Timestamp", "0", T_OP_SET);
 808                 vp->vp_date = now.tv_sec;
 809 #else
 810                 rad_assert("Internal sanity check failed");
 811 #endif
 812         }
 813
 814         radius_pairmake(request, &request->proxy->vps,
 815                         "NAS-Identifier", "Status Check. Are you alive?",
 816                         T_OP_SET);
 817
 818         request->proxy->dst_ipaddr = home->ipaddr;
 819         request->proxy->dst_port = home->port;
 820         request->home_server = home;
 821
 822         rad_assert(request->proxy_listener == NULL);
 823
 824         if (!insert_into_proxy_hash(request, FALSE)) {
 825                 RDEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 826                        request->number);
 827                 ev_request_free(&request);
 828                 return;
 829         }
 830         rad_assert(request->proxy_listener != NULL);
 831         request->proxy_listener->send(request->proxy_listener,
 832                                       request);
 833
 834         request->next_callback = NULL;
 835         request->child_state = REQUEST_PROXIED;
 836         request->when.tv_sec += home->ping_timeout;;
 837
 838         INSERT_EVENT(no_response_to_ping, request);
 839
 840         /*
 841          *      Add +/- 2s of jitter, as suggested in RFC 3539
 842          *      and in the Issues and Fixes draft.
 843          */
 844         home->when.tv_sec += home->ping_interval - 2;
 845
 846         jitter = fr_rand();
 847         jitter ^= (jitter >> 10);
 848         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 849
 850         tv_add(&home->when, jitter);
 851
 852         INSERT_EVENT(ping_home_server, home);
 853 }
 854
 855
 856 void mark_home_server_dead(home_server *home, struct timeval *when)
 857 {
 858         int previous_state = home->state;
 859         char buffer[128];
 860
 861         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 862                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 863                          buffer, sizeof(buffer)),
 864                home->port);
 865
 866         home->state = HOME_STATE_IS_DEAD;
 867         home->num_received_pings = 0;
 868
 869         if (home->ping_check != HOME_PING_CHECK_NONE) {
 870                 /*
 871                  *      If the control socket marks us dead, start
 872                  *      pinging.  Otherwise, we already started
 873                  *      pinging when it was marked "zombie".
 874                  */
 875                 if (previous_state == HOME_STATE_ALIVE) {
 876                         ping_home_server(home);
 877                 }
 878
 879         } else {
 880                 /*
 881                  *      Revive it after a fixed period of time.  This
 882                  *      is very, very, bad.
 883                  */
 884                 home->when = *when;
 885                 home->when.tv_sec += home->revive_interval;
 886
 887                 INSERT_EVENT(revive_home_server, home);
 888         }
 889 }
 890
 891 static void check_for_zombie_home_server(REQUEST *request)
 892 {
 893         home_server *home;
 894         struct timeval when;
 895
 896         home = request->home_server;
 897
 898         if (home->state != HOME_STATE_ZOMBIE) return;
 899
 900         when = home->zombie_period_start;
 901         when.tv_sec += home->zombie_period;
 902
 903         fr_event_now(el, &now);
 904         if (timercmp(&now, &when, <)) {
 905                 return;
 906         }
 907
 908         mark_home_server_dead(home, &request->when);
 909 }
 910
 911 static int proxy_to_virtual_server(REQUEST *request);
 912
 913 static int virtual_server_handler(UNUSED REQUEST *request)
 914 {
 915         proxy_to_virtual_server(request);
 916         return 0;
 917 }
 918
 919 static void proxy_fallback_handler(REQUEST *request)
 920 {
 921         /*
 922          *      A proper time is required for wait_a_bit.
 923          */
 924         request->delay = USEC / 10;
 925         gettimeofday(&now, NULL);
 926         request->next_when = now;
 927         tv_add(&request->next_when, request->delay);
 928         request->next_callback = wait_a_bit;
 929
 930         /*
 931          *      Re-queue the request.
 932          */
 933         request->child_state = REQUEST_QUEUED;
 934
 935         rad_assert(request->proxy != NULL);
 936         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 937                 request->child_state = REQUEST_DONE;
 938         }
 939
 940 #ifdef HAVE_PTHREAD_H
 941         /*
 942          *      MAY free the request if we're over max_request_time,
 943          *      AND we're not in threaded mode!
 944          *
 945          *      Note that we call this ONLY if we're threaded, as
 946          *      if we're NOT threaded, request_post_handler() calls
 947          *      wait_a_bit(), which means that "request" may not
 948          *      exist any more...
 949          */
 950         if (have_children) wait_a_bit(request);
 951 #endif
 952 }
 953
 954
 955 static int setup_post_proxy_fail(REQUEST *request)
 956 {
 957         DICT_VALUE *dval = NULL;
 958         VALUE_PAIR *vp;
 959
 960         request->child_state = REQUEST_RUNNING;
 961
 962         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 963                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 964
 965         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 966                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 967
 968 #ifdef WITH_COA
 969                 /*
 970                  *      See no_response_to_coa_request
 971                  */
 972         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 973                 request->packet->code &= 0xff; /* restore it */
 974
 975                 if (request->proxy->code == PW_COA_REQUEST) {
 976                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 977
 978                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 979                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 980                 } else {
 981                         return 0;
 982                 }
 983
 984 #endif
 985         } else {
 986                 return 0;
 987         }
 988
 989         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 990
 991         if (!dval) {
 992                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 993                 return 0;
 994         }
 995
 996         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 997         if (!vp) vp = radius_paircreate(request, &request->config_items,
 998                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 999         vp->vp_integer = dval->value;
1000
1001         rad_assert(request->proxy_reply == NULL);
1002
1003         return 1;
1004 }
1005
1006
1007 static int null_handler(UNUSED REQUEST *request)
1008 {
1009         return 0;
1010 }
1011
1012 static void post_proxy_fail_handler(REQUEST *request)
1013 {
1014         /*
1015          *      A proper time is required for wait_a_bit.
1016          */
1017         request->delay = USEC / 10;
1018         gettimeofday(&now, NULL);
1019
1020         /*
1021          *      Not set up to run Post-Proxy-Type = Fail.
1022          *
1023          *      Mark the request as still running, and figure out what
1024          *      to do next.
1025          */
1026         if (!setup_post_proxy_fail(request)) {
1027                 request_post_handler(request);
1028
1029         } else {
1030                 /*
1031                  *      Re-queue the request.
1032                  */
1033                 request->child_state = REQUEST_QUEUED;
1034
1035                 /*
1036                  *      There is a post-proxy-type of fail.  We run
1037                  *      the request through the pre/post proxy
1038                  *      handlers, just like it was a real proxied
1039                  *      request.  However, we set the per-request
1040                  *      handler to NULL, as we don't want to do
1041                  *      anything else.
1042                  *
1043                  *      Note that when we're not threaded, this will
1044                  *      process the request even if it's greater than
1045                  *      max_request_time.  That's not fatal.
1046                  */
1047                 request->priority = 0;
1048                 rad_assert(request->proxy != NULL);
1049                 thread_pool_addrequest(request, null_handler);
1050         }
1051
1052         /*
1053          *      MAY free the request if we're over max_request_time,
1054          *      AND we're not in threaded mode!
1055          *
1056          *      Note that we call this ONLY if we're threaded, as
1057          *      if we're NOT threaded, request_post_handler() calls
1058          *      wait_a_bit(), which means that "request" may not
1059          *      exist any more...
1060          */
1061         if (have_children) wait_a_bit(request);
1062 }
1063
1064
1065 /* maybe check this against wait_for_proxy_id_to_expire? */
1066 static void no_response_to_proxied_request(void *ctx)
1067 {
1068         REQUEST *request = ctx;
1069         home_server *home;
1070         char buffer[128];
1071
1072         rad_assert(request->magic == REQUEST_MAGIC);
1073         rad_assert(request->child_state == REQUEST_PROXIED);
1074
1075         /*
1076          *      If we've failed over to an internal home server,
1077          *      replace the callback with the correct one.  This
1078          *      is due to locking issues with child threads...
1079          */
1080         if (request->home_server->server) {
1081                 wait_a_bit(request);
1082                 return;
1083         }
1084
1085         check_for_zombie_home_server(request);
1086
1087         home = request->home_server;
1088
1089         /*
1090          *      The default as of 2.1.7 is to allow requests to
1091          *      fail-over to a backup home server when this one does
1092          *      not respond.  The old behavior can be configured as
1093          *      well.
1094          */
1095         if (home->no_response_fail) {
1096                 radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
1097                        request->number,
1098                        inet_ntop(request->proxy->dst_ipaddr.af,
1099                                  &request->proxy->dst_ipaddr.ipaddr,
1100                                  buffer, sizeof(buffer)),
1101                        request->proxy->dst_port);
1102
1103                 post_proxy_fail_handler(request);
1104         }
1105
1106         /*
1107          *      Don't touch request due to race conditions
1108          */
1109         if (home->state == HOME_STATE_IS_DEAD) {
1110                 rad_assert(home->ev != NULL); /* or it will never wake up */
1111                 return;
1112         }
1113
1114         /*
1115          *      Enable the zombie period when we notice that the home
1116          *      server hasn't responded.  We do NOT back-date the start
1117          *      of the zombie period.
1118          */
1119         if (home->state == HOME_STATE_ALIVE) {
1120                 radlog(L_ERR, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1121                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1122                                  buffer, sizeof(buffer)),
1123                        home->port);
1124                 home->state = HOME_STATE_ZOMBIE;
1125                 home->zombie_period_start = now;
1126
1127                 /*
1128                  *      Start pinging the home server.
1129                  */
1130                 ping_home_server(home);
1131         }
1132 }
1133 #endif
1134
1135 static void wait_a_bit(void *ctx)
1136 {
1137         struct timeval when;
1138         REQUEST *request = ctx;
1139         fr_event_callback_t callback = NULL;
1140
1141         rad_assert(request->magic == REQUEST_MAGIC);
1142
1143 #ifdef WITH_COA
1144         /*
1145          *      The CoA request is a new (internally generated)
1146          *      request, created in a child thread.  We therefore need
1147          *      some way to tie its events back into the main event
1148          *      handler.
1149          */
1150         if (request->coa && !request->coa->proxy_reply &&
1151             request->coa->next_callback) {
1152                 request->coa->when = request->coa->next_when;
1153                 INSERT_EVENT(request->coa->next_callback, request->coa);
1154                 request->coa->next_callback = NULL;
1155                 request->coa->parent = NULL;
1156                 request->coa = NULL;
1157         }
1158 #endif
1159
1160         switch (request->child_state) {
1161         case REQUEST_QUEUED:
1162         case REQUEST_RUNNING:
1163                 when = request->received;
1164                 when.tv_sec += request->root->max_request_time;
1165
1166                 /*
1167                  *      Normally called from the event loop with the
1168                  *      proper event loop time.  Otherwise, called from
1169                  *      post proxy fail handler, which sets "now", and
1170                  *      this call won't re-set it, because we're not
1171                  *      in the event loop.
1172                  */
1173                 fr_event_now(el, &now);
1174
1175                 /*
1176                  *      Request still has more time.  Continue
1177                  *      waiting.
1178                  */
1179                 if (timercmp(&now, &when, <) ||
1180                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1181                      (request->child_state == REQUEST_QUEUED))) {
1182                         if (request->delay < (USEC / 10)) {
1183                                 request->delay = USEC / 10;
1184                         }
1185                         request->delay += request->delay >> 1;
1186
1187 #ifdef WITH_DETAIL
1188                         /*
1189                          *      Cap wait at some sane value for detail
1190                          *      files.
1191                          */
1192                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1193                             (request->delay > (request->root->max_request_time * USEC))) {
1194                                 request->delay = request->root->max_request_time * USEC;
1195                         }
1196 #endif
1197
1198                         request->when = now;
1199                         tv_add(&request->when, request->delay);
1200                         callback = wait_a_bit;
1201                         break;
1202                 }
1203
1204 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1205                 /*
1206                  *      A child thread MAY still be running on the
1207                  *      request.  Ask the thread to stop working on
1208                  *      the request.
1209                  */
1210                 if (have_children) {
1211                         /* FIXME: kill unresponsive children? */
1212
1213                         /*
1214                          *      Print this error message ONLY if
1215                          *      there's a child currently processing
1216                          *      the request.  As we don't have thread
1217                          *      locks here, there may be race
1218                          *      conditions on this check.  But it's
1219                          *      just an error message, so that's OK.
1220                          */
1221                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1222                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1223                                        request->number,
1224                                        request->module ? request->module : "<server core>",
1225                                        request->component ? request->component : "<server core>");
1226                         }
1227
1228                         request->master_state = REQUEST_STOP_PROCESSING;
1229
1230                         request->delay = USEC / 4;
1231                         tv_add(&request->when, request->delay);
1232                         callback = wait_for_child_to_die;
1233                         break;
1234                 }
1235 #endif
1236
1237                 /*
1238                  *      Else there are no child threads.  We probably
1239                  *      should have just marked the request as 'done'
1240                  *      elsewhere, like in the post-proxy-fail
1241                  *      handler.  But doing that would involve
1242                  *      checking for max_request_time in multiple
1243                  *      places, so this may be simplest.
1244                  */
1245                 request->child_state = REQUEST_DONE;
1246                 /* FALL-THROUGH */
1247
1248                 /*
1249                  *      Mark the request as no longer running,
1250                  *      and clean it up.
1251                  */
1252         case REQUEST_DONE:
1253 #ifdef HAVE_PTHREAD_H
1254                 request->child_pid = NO_SUCH_CHILD_PID;
1255 #endif
1256
1257 #ifdef WTH_COA
1258                 /*
1259                  *      This is a CoA request.  It's been divorced
1260                  *      from everything else, so we clean it up now.
1261                  */
1262                 if (!request->in_request_hash &&
1263                     request->proxy &&
1264                     (request->packet->code != request->proxy->code) &&
1265                     ((request->proxy->code == PW_COA_REQUEST) ||
1266                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1267                         /*
1268                          *      FIXME: Do CoA MIBs
1269                          */
1270                         ev_request_free(&request);
1271                         return;
1272                 }
1273 #endif
1274                 request_stats_final(request);
1275                 cleanup_delay(request);
1276                 return;
1277
1278         case REQUEST_REJECT_DELAY:
1279         case REQUEST_CLEANUP_DELAY:
1280 #ifdef HAVE_PTHREAD_H
1281                 request->child_pid = NO_SUCH_CHILD_PID;
1282 #endif
1283                 request_stats_final(request);
1284
1285         case REQUEST_PROXIED:
1286                 rad_assert(request->next_callback != NULL);
1287                 rad_assert(request->next_callback != wait_a_bit);
1288
1289                 request->when = request->next_when;
1290                 callback = request->next_callback;
1291                 request->next_callback = NULL;
1292                 break;
1293
1294         default:
1295                 rad_panic("Internal sanity check failure");
1296                 return;
1297         }
1298
1299         /*
1300          *      Something major went wrong.  Discard the request, and
1301          *      keep running.
1302          *
1303          *      FIXME: No idea why this happens or how to fix it...
1304          *      It seems to happen *only* when requests are proxied,
1305          *      and where the home server doesn't respond.  So it looks
1306          *      like a race condition above, but it happens in debug
1307          *      mode, with no threads...
1308          */
1309         if (!callback) {
1310                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1311                 ev_request_free(&request);
1312                 return;
1313         }
1314
1315         INSERT_EVENT(callback, request);
1316 }
1317
1318 #ifdef WITH_COA
1319 static void no_response_to_coa_request(void *ctx)
1320 {
1321         REQUEST *request = ctx;
1322         char buffer[128];
1323
1324         rad_assert(request->magic == REQUEST_MAGIC);
1325         rad_assert(request->child_state == REQUEST_PROXIED);
1326         rad_assert(request->home_server != NULL);
1327         rad_assert(!request->in_request_hash);
1328
1329         radlog(L_ERR, "No response to CoA request sent to %s",
1330                inet_ntop(request->proxy->dst_ipaddr.af,
1331                          &request->proxy->dst_ipaddr.ipaddr,
1332                          buffer, sizeof(buffer)));
1333
1334         /*
1335          *      Hack.
1336          */
1337         request->packet->code |= (PW_COA_REQUEST << 8);
1338         post_proxy_fail_handler(request);
1339 }
1340
1341
1342 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1343 {
1344         VALUE_PAIR *vp;
1345
1346         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1347         if (!vp) return 0;
1348
1349         vp->vp_date = when;
1350
1351         if (packet->data) {
1352                 free(packet->data);
1353                 packet->data = NULL;
1354                 packet->data_len = 0;
1355         }
1356
1357         return 1;               /* time stamp updated */
1358 }
1359
1360
1361 /*
1362  *      Called when we haven't received a response to a CoA request.
1363  */
1364 static void retransmit_coa_request(void *ctx)
1365 {
1366         int delay, frac;
1367         struct timeval mrd;
1368         REQUEST *request = ctx;
1369
1370         rad_assert(request->magic == REQUEST_MAGIC);
1371         rad_assert(request->child_state == REQUEST_PROXIED);
1372         rad_assert(request->home_server != NULL);
1373         rad_assert(!request->in_request_hash);
1374         rad_assert(request->parent == NULL);
1375
1376         fr_event_now(el, &now);
1377
1378         /*
1379          *      Cap count at MRC, if it is non-zero.
1380          */
1381         if (request->home_server->coa_mrc &&
1382             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1383                 no_response_to_coa_request(request);
1384                 return;
1385         }
1386
1387         /*
1388          *      RFC 5080 Section 2.2.1
1389          *
1390          *      RT = 2*RTprev + RAND*RTprev
1391          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1392          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1393          */
1394         delay = fr_rand();
1395         delay ^= (delay >> 16);
1396         delay &= 0xffff;
1397         frac = request->delay / 5;
1398         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1399
1400         delay += (2 * request->delay) - (request->delay / 10);
1401
1402         /*
1403          *      Cap delay at MRT, if MRT is non-zero.
1404          */
1405         if (request->home_server->coa_mrt &&
1406             (delay > (request->home_server->coa_mrt * USEC))) {
1407                 int mrt_usec = request->home_server->coa_mrt * USEC;
1408
1409                 /*
1410                  *      delay = MRT + RAND * MRT
1411                  *            = 0.9 MRT + rand(0,.2)  * MRT
1412                  */
1413                 delay = fr_rand();
1414                 delay ^= (delay >> 15);
1415                 delay &= 0x1ffff;
1416                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1417                 delay += mrt_usec - (mrt_usec / 10);
1418         }
1419
1420         request->delay = delay;
1421         request->when = now;
1422         tv_add(&request->when, request->delay);
1423         mrd = request->proxy_when;
1424         mrd.tv_sec += request->home_server->coa_mrd;
1425
1426         /*
1427          *      Cap duration at MRD.
1428          */
1429         if (timercmp(&mrd, &request->when, <)) {
1430                 request->when = mrd;
1431                 INSERT_EVENT(no_response_to_coa_request, request);
1432
1433         } else {
1434                 INSERT_EVENT(retransmit_coa_request, request);
1435         }
1436
1437         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1438                 if (!insert_into_proxy_hash(request, TRUE)) {
1439                         DEBUG("ERROR: Failed re-inserting CoA request into proxy hash.");
1440                         return;
1441                 }
1442
1443                 request->num_proxied_requests = 0;
1444                 request->num_proxied_responses = 0;
1445         }
1446
1447         request->num_proxied_requests++;
1448         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1449
1450         request->proxy_listener->send(request->proxy_listener,
1451                                       request);
1452 }
1453
1454
1455 /*
1456  *      The original request is either DONE, or in CLEANUP_DELAY.
1457  */
1458 static int originated_coa_request(REQUEST *request)
1459 {
1460         int delay, rcode, pre_proxy_type = 0;
1461         VALUE_PAIR *vp;
1462         REQUEST *coa;
1463         fr_ipaddr_t ipaddr;
1464         char buffer[256];
1465
1466         rad_assert(request->proxy == NULL);
1467         rad_assert(!request->in_proxy_hash);
1468         rad_assert(request->proxy_reply == NULL);
1469
1470         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1471         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1472         if (vp) {
1473                 if (vp->vp_integer == 0) {
1474                         ev_request_free(&request->coa);
1475                         return 1;       /* success */
1476                 }
1477
1478                 if (!request->coa) request_alloc_coa(request);
1479                 if (!request->coa) return 0;
1480         }
1481
1482         coa = request->coa;
1483
1484         /*
1485          *      src_ipaddr will be set up in proxy_encode.
1486          */
1487         memset(&ipaddr, 0, sizeof(ipaddr));
1488         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1489         if (vp) {
1490                 ipaddr.af = AF_INET;
1491                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1492
1493         } else if ((vp = pairfind(coa->proxy->vps,
1494                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1495                 ipaddr.af = AF_INET6;
1496                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1497
1498         } else if ((vp = pairfind(coa->proxy->vps,
1499                                   PW_HOME_SERVER_POOL)) != NULL) {
1500                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1501                                                   HOME_TYPE_COA);
1502                 if (!coa->home_pool) {
1503                         RDEBUG2("WARNING: No such home_server_pool %s",
1504                                vp->vp_strvalue);
1505         fail:
1506                         ev_request_free(&request->coa);
1507                         return 0;
1508                 }
1509
1510                 /*
1511                  *      Prefer
1512                  */
1513         } else if (request->client->coa_pool) {
1514                 coa->home_pool = request->client->coa_pool;
1515
1516         } else if (request->client->coa_server) {
1517                 coa->home_server = request->client->coa_server;
1518
1519         } else {
1520                 /*
1521                  *      If all else fails, send it to the client that
1522                  *      originated this request.
1523                  */
1524                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1525         }
1526
1527         /*
1528          *      Use the pool, if it exists.
1529          */
1530         if (coa->home_pool) {
1531                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1532                 if (!coa->home_server) {
1533                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1534                         goto fail;
1535                 }
1536
1537         } else if (!coa->home_server) {
1538                 int port = PW_COA_UDP_PORT;
1539
1540                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1541                 if (vp) port = vp->vp_integer;
1542
1543                 coa->home_server = home_server_find(&ipaddr, port);
1544                 if (!coa->home_server) {
1545                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1546                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1547                                          buffer, sizeof(buffer)), port);
1548                         goto fail;
1549                 }
1550         }
1551
1552         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1553         if (vp) {
1554                 switch (vp->vp_integer) {
1555                 case PW_COA_REQUEST:
1556                 case PW_DISCONNECT_REQUEST:
1557                         coa->proxy->code = vp->vp_integer;
1558                         break;
1559
1560                 default:
1561                         DEBUG("Cannot set CoA Packet-Type to code %d",
1562                               vp->vp_integer);
1563                         goto fail;
1564                 }
1565         }
1566
1567         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1568
1569         /*
1570          *      The rest of the server code assumes that
1571          *      request->packet && request->reply exist.  Copy them
1572          *      from the original request.
1573          */
1574         rad_assert(coa->packet != NULL);
1575         rad_assert(coa->packet->vps == NULL);
1576         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1577         coa->packet->vps = paircopy(request->packet->vps);
1578         coa->packet->data = NULL;
1579         rad_assert(coa->reply != NULL);
1580         rad_assert(coa->reply->vps == NULL);
1581         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1582         coa->reply->vps = paircopy(request->reply->vps);
1583         coa->reply->data = NULL;
1584         coa->config_items = paircopy(request->config_items);
1585
1586         /*
1587          *      Call the pre-proxy routines.
1588          */
1589         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1590         if (vp) {
1591                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1592                 pre_proxy_type = vp->vp_integer;
1593         }
1594
1595         if (coa->home_pool && coa->home_pool->virtual_server) {
1596                 const char *old_server = coa->server;
1597
1598                 coa->server = coa->home_pool->virtual_server;
1599                 RDEBUG2(" server %s {", coa->server);
1600                 rcode = module_pre_proxy(pre_proxy_type, coa);
1601                 RDEBUG2(" }");
1602                 coa->server = old_server;
1603         } else {
1604                 rcode = module_pre_proxy(pre_proxy_type, coa);
1605         }
1606         switch (rcode) {
1607         default:
1608                 goto fail;
1609
1610         /*
1611          *      Only send the CoA packet if the pre-proxy code succeeded.
1612          */
1613         case RLM_MODULE_NOOP:
1614         case RLM_MODULE_OK:
1615         case RLM_MODULE_UPDATED:
1616                 break;
1617         }
1618
1619         /*
1620          *      Source IP / port is set when the proxy socket
1621          *      is chosen.
1622          */
1623         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1624         coa->proxy->dst_port = coa->home_server->port;
1625
1626         if (!insert_into_proxy_hash(coa, FALSE)) {
1627                 DEBUG("ERROR: Failed inserting CoA request into proxy hash.");
1628                 goto fail;
1629         }
1630
1631         /*
1632          *      We CANNOT divorce the CoA request from the parent
1633          *      request.  This function is running in a child thread,
1634          *      and we need access to the main event loop in order to
1635          *      to add the timers for the CoA packet.  See
1636          *      wait_a_bit().
1637          */
1638
1639         /*
1640          *      Forget about the original request completely at this
1641          *      point.
1642          */
1643         request = coa;
1644
1645         gettimeofday(&request->proxy_when, NULL);
1646         request->received = request->next_when = request->proxy_when;
1647         rad_assert(request->proxy_reply == NULL);
1648
1649         /*
1650          *      Implement re-transmit algorithm as per RFC 5080
1651          *      Section 2.2.1.
1652          *
1653          *      We want IRT + RAND*IRT
1654          *      or 0.9 IRT + rand(0,.2) IRT
1655          *
1656          *      2^20 ~ USEC, and we want 2.
1657          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1658          */
1659         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1660         request->delay = delay * request->home_server->coa_irt;
1661         delay = request->home_server->coa_irt * USEC;
1662         delay -= delay / 10;
1663         delay += request->delay;
1664
1665         request->delay = delay;
1666         tv_add(&request->next_when, delay);
1667         request->next_callback = retransmit_coa_request;
1668
1669         /*
1670          *      Note that we set proxied BEFORE sending the packet.
1671          *
1672          *      Once we send it, the request is tainted, as
1673          *      another thread may have picked it up.  Don't
1674          *      touch it!
1675          */
1676         request->num_proxied_requests = 1;
1677         request->num_proxied_responses = 0;
1678         request->child_pid = NO_SUCH_CHILD_PID;
1679
1680         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1681
1682         request->child_state = REQUEST_PROXIED;
1683
1684         DEBUG_PACKET(request, request->proxy, 1);
1685
1686         request->proxy_listener->send(request->proxy_listener,
1687                                       request);
1688         return 1;
1689 }
1690 #endif  /* WITH_COA */
1691
1692 #ifdef WITH_PROXY
1693 static int process_proxy_reply(REQUEST *request)
1694 {
1695         int rcode;
1696         int post_proxy_type = 0;
1697         VALUE_PAIR *vp;
1698
1699         /*
1700          *      Delete any reply we had accumulated until now.
1701          */
1702         pairfree(&request->reply->vps);
1703
1704         /*
1705          *      Run the packet through the post-proxy stage,
1706          *      BEFORE playing games with the attributes.
1707          */
1708         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1709         if (vp) {
1710                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1711                 post_proxy_type = vp->vp_integer;
1712         }
1713
1714         if (request->home_pool && request->home_pool->virtual_server) {
1715                 const char *old_server = request->server;
1716
1717                 request->server = request->home_pool->virtual_server;
1718                 RDEBUG2(" server %s {", request->server);
1719                 rcode = module_post_proxy(post_proxy_type, request);
1720                 RDEBUG2(" }");
1721                 request->server = old_server;
1722         } else {
1723                 rcode = module_post_proxy(post_proxy_type, request);
1724         }
1725
1726 #ifdef WITH_COA
1727         if (request->packet->code == request->proxy->code)
1728           /*
1729            *    Don't run the next bit if we originated a CoA
1730            *    packet, after receiving an Access-Request or
1731            *    Accounting-Request.
1732            */
1733 #endif
1734
1735         /*
1736          *      There may NOT be a proxy reply, as we may be
1737          *      running Post-Proxy-Type = Fail.
1738          */
1739         if (request->proxy_reply) {
1740                 /*
1741                  *      Delete the Proxy-State Attributes from
1742                  *      the reply.  These include Proxy-State
1743                  *      attributes from us and remote server.
1744                  */
1745                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1746
1747                 /*
1748                  *      Add the attributes left in the proxy
1749                  *      reply to the reply list.
1750                  */
1751                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1752                 request->proxy_reply->vps = NULL;
1753
1754                 /*
1755                  *      Free proxy request pairs.
1756                  */
1757                 pairfree(&request->proxy->vps);
1758         }
1759
1760         switch (rcode) {
1761         default:  /* Don't do anything */
1762                 break;
1763         case RLM_MODULE_FAIL:
1764                 /* FIXME: debug print stuff */
1765                 request->child_state = REQUEST_DONE;
1766                 return 0;
1767
1768         case RLM_MODULE_HANDLED:
1769                 /* FIXME: debug print stuff */
1770                 request->child_state = REQUEST_DONE;
1771                 return 0;
1772         }
1773
1774         return 1;
1775 }
1776 #endif
1777
1778 static int request_pre_handler(REQUEST *request)
1779 {
1780         int rcode;
1781
1782         rad_assert(request->magic == REQUEST_MAGIC);
1783         rad_assert(request->packet != NULL);
1784
1785         request->child_state = REQUEST_RUNNING;
1786
1787         /*
1788          *      Don't decode the packet if it's an internal "fake"
1789          *      request.  Instead, just return so that the caller can
1790          *      process it.
1791          */
1792         if (request->packet->dst_port == 0) {
1793                 request->username = pairfind(request->packet->vps,
1794                                              PW_USER_NAME);
1795                 request->password = pairfind(request->packet->vps,
1796                                              PW_USER_PASSWORD);
1797                 return 1;
1798         }
1799
1800 #ifdef WITH_PROXY
1801         /*
1802          *      Put the decoded packet into it's proper place.
1803          */
1804         if (request->proxy_reply != NULL) {
1805                 rcode = request->proxy_listener->decode(request->proxy_listener,
1806                                                         request);
1807                 DEBUG_PACKET(request, request->proxy_reply, 0);
1808         } else
1809 #endif
1810         if (request->packet->vps == NULL) {
1811                 rcode = request->listener->decode(request->listener, request);
1812
1813                 if (debug_condition) {
1814                         int result = FALSE;
1815                         const char *my_debug = debug_condition;
1816
1817                         /*
1818                          *      Ignore parse errors.
1819                          */
1820                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1821                                                   &my_debug, 1,
1822                                                   &result);
1823                         if (result) {
1824                                 request->options = 2;
1825                                 request->radlog = radlog_request;
1826                         }
1827                 }
1828
1829                 DEBUG_PACKET(request, request->packet, 0);
1830         } else {
1831                 rcode = 0;
1832         }
1833
1834         if (rcode < 0) {
1835                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1836                 request->child_state = REQUEST_DONE;
1837                 return 0;
1838         }
1839
1840         if (!request->username) {
1841                 request->username = pairfind(request->packet->vps,
1842                                              PW_USER_NAME);
1843         }
1844
1845 #ifdef WITH_PROXY
1846         if (request->proxy) {
1847                 return process_proxy_reply(request);
1848 #endif
1849         }
1850
1851         return 1;
1852 }
1853
1854
1855 #ifdef WITH_PROXY
1856 /*
1857  *      Do state handling when we proxy a request.
1858  */
1859 static int proxy_request(REQUEST *request)
1860 {
1861         struct timeval when;
1862         char buffer[128];
1863
1864         if (request->home_server->server) {
1865                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1866                 return 0;
1867         }
1868
1869         if (!insert_into_proxy_hash(request, FALSE)) {
1870                 RDEBUG("ERROR: Failed inserting request into proxy hash.");
1871                 return 0;
1872         }
1873
1874         request->proxy_listener->encode(request->proxy_listener, request);
1875
1876         when = request->received;
1877         when.tv_sec += request->root->max_request_time;
1878
1879         gettimeofday(&request->proxy_when, NULL);
1880
1881         request->next_when = request->proxy_when;
1882         request->next_when.tv_sec += request->home_server->response_window;
1883
1884         rad_assert(request->home_server->response_window > 0);
1885
1886         if (timercmp(&when, &request->next_when, <)) {
1887                 request->next_when = when;
1888         }
1889         request->next_callback = no_response_to_proxied_request;
1890
1891         RDEBUG2("Proxying request %d to home server %s port %d",
1892                request->number,
1893                inet_ntop(request->proxy->dst_ipaddr.af,
1894                          &request->proxy->dst_ipaddr.ipaddr,
1895                          buffer, sizeof(buffer)),
1896                request->proxy->dst_port);
1897
1898         /*
1899          *      Note that we set proxied BEFORE sending the packet.
1900          *
1901          *      Once we send it, the request is tainted, as
1902          *      another thread may have picked it up.  Don't
1903          *      touch it!
1904          */
1905         request->num_proxied_requests = 1;
1906         request->num_proxied_responses = 0;
1907 #ifdef HAVE_PTHREAD_H
1908         request->child_pid = NO_SUCH_CHILD_PID;
1909 #endif
1910         request->child_state = REQUEST_PROXIED;
1911
1912         DEBUG_PACKET(request, request->proxy, 1);
1913
1914         request->proxy_listener->send(request->proxy_listener,
1915                                       request);
1916         return 1;
1917 }
1918
1919
1920 /*
1921  *      "Proxy" the request by sending it to a new virtual server.
1922  */
1923 static int proxy_to_virtual_server(REQUEST *request)
1924 {
1925         REQUEST *fake;
1926         RAD_REQUEST_FUNP fun;
1927
1928         if (!request->home_server || !request->home_server->server) return 0;
1929
1930         if (request->parent) {
1931                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1932                 return 0;
1933         }
1934
1935         fake = request_alloc_fake(request);
1936         if (!fake) {
1937                 RDEBUG2("WARNING: Out of memory");
1938                 return 0;
1939         }
1940
1941         fake->packet->vps = paircopy(request->proxy->vps);
1942         fake->server = request->home_server->server;
1943
1944         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
1945                 fun = rad_authenticate;
1946
1947 #ifdef WITH_ACCOUNTING
1948         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
1949                 fun = rad_accounting;
1950 #endif
1951
1952         } else {
1953                 RDEBUG2("Unknown packet type %d", request->proxy->code);
1954                 ev_request_free(&fake);
1955                 return 0;
1956         }
1957
1958         RDEBUG2(">>> Sending proxied request internally to virtual server.");
1959         radius_handle_request(fake, fun);
1960         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
1961
1962         if (fake->reply->code != 0) {
1963                 request->proxy_reply = fake->reply;
1964                 fake->reply = NULL;
1965         } else {
1966                 /*
1967                  *      There was no response
1968                  */
1969                 setup_post_proxy_fail(request);
1970         }
1971
1972         ev_request_free(&fake);
1973
1974         process_proxy_reply(request);
1975
1976         /*
1977          *      Process it through the normal section again, but ONLY
1978          *      if we received a proxy reply..
1979          */
1980         if (request->proxy_reply) {
1981                 if (request->server) RDEBUG("server %s {",
1982                                             request->server != NULL ?
1983                                             request->server : "");
1984                 fun(request);
1985
1986                 if (request->server) RDEBUG("} # server %s",
1987                                             request->server != NULL ?
1988                                             request->server : "");
1989         }
1990
1991         return 2;               /* success, but NOT '1' !*/
1992 }
1993
1994 /*
1995  *      Return 1 if we did proxy it, or the proxy attempt failed
1996  *      completely.  Either way, the caller doesn't touch the request
1997  *      any more if we return 1.
1998  */
1999 static int successfully_proxied_request(REQUEST *request)
2000 {
2001         int rcode;
2002         int pre_proxy_type = 0;
2003         VALUE_PAIR *realmpair;
2004         VALUE_PAIR *strippedname;
2005         VALUE_PAIR *vp;
2006         char *realmname = NULL;
2007         home_server *home;
2008         REALM *realm = NULL;
2009         home_pool_t *pool;
2010
2011         /*
2012          *      If it was already proxied, do nothing.
2013          *
2014          *      FIXME: This should really be a serious error.
2015          */
2016         if (request->in_proxy_hash ||
2017             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2018                 return 0;
2019         }
2020
2021         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2022         if (!realmpair || (realmpair->length == 0)) {
2023                 int pool_type;
2024
2025                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2026                 if (!vp) return 0;
2027
2028                 switch (request->packet->code) {
2029                 case PW_AUTHENTICATION_REQUEST:
2030                         pool_type = HOME_TYPE_AUTH;
2031                         break;
2032
2033 #ifdef WITH_ACCOUNTING
2034                 case PW_ACCOUNTING_REQUEST:
2035                         pool_type = HOME_TYPE_ACCT;
2036                         break;
2037 #endif
2038
2039 #ifdef WITH_COA
2040                 case PW_COA_REQUEST:
2041                 case PW_DISCONNECT_REQUEST:
2042                         pool_type = HOME_TYPE_COA;
2043                         break;
2044 #endif
2045
2046                 default:
2047                         return 0;
2048                 }
2049
2050                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2051                 if (!pool) {
2052                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2053                                 vp->vp_strvalue);
2054                         return 0;
2055                 }
2056
2057                 realmname = NULL; /* no realms */
2058                 realm = NULL;
2059                 goto found_pool;
2060         }
2061
2062         realmname = (char *) realmpair->vp_strvalue;
2063
2064         realm = realm_find2(realmname);
2065         if (!realm) {
2066                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2067                 return 0;
2068         }
2069
2070         /*
2071          *      Figure out which pool to use.
2072          */
2073         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2074                 pool = realm->auth_pool;
2075
2076 #ifdef WITH_ACCOUNTING
2077         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2078                 pool = realm->acct_pool;
2079 #endif
2080
2081 #ifdef WITH_COA
2082         } else if ((request->packet->code == PW_COA_REQUEST) ||
2083                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2084                 pool = realm->acct_pool;
2085 #endif
2086
2087         } else {
2088                 rad_panic("Internal sanity check failed");
2089         }
2090
2091         if (!pool) {
2092                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2093                        realmname);
2094                 return 0;
2095         }
2096
2097 found_pool:
2098         home = home_server_ldb(realmname, pool, request);
2099         if (!home) {
2100                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2101                        realmname);
2102                 return -1;
2103         }
2104         request->home_pool = pool;
2105
2106 #ifdef WITH_COA
2107         /*
2108          *      Once we've decided to proxy a request, we cannot send
2109          *      a CoA packet.  So we free up any CoA packet here.
2110          */
2111         ev_request_free(&request->coa);
2112 #endif
2113         /*
2114          *      Remember that we sent the request to a Realm.
2115          */
2116         if (realmname) pairadd(&request->packet->vps,
2117                                pairmake("Realm", realmname, T_OP_EQ));
2118
2119         /*
2120          *      Strip the name, if told to.
2121          *
2122          *      Doing it here catches the case of proxied tunneled
2123          *      requests.
2124          */
2125         if (realm && (realm->striprealm == TRUE) &&
2126            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2127                 /*
2128                  *      If there's a Stripped-User-Name attribute in
2129                  *      the request, then use THAT as the User-Name
2130                  *      for the proxied request, instead of the
2131                  *      original name.
2132                  *
2133                  *      This is done by making a copy of the
2134                  *      Stripped-User-Name attribute, turning it into
2135                  *      a User-Name attribute, deleting the
2136                  *      Stripped-User-Name and User-Name attributes
2137                  *      from the vps list, and making the new
2138                  *      User-Name the head of the vps list.
2139                  */
2140                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2141                 if (!vp) {
2142                         vp = radius_paircreate(request, NULL,
2143                                                PW_USER_NAME, PW_TYPE_STRING);
2144                         rad_assert(vp != NULL); /* handled by above function */
2145                         /* Insert at the START of the list */
2146                         vp->next = request->proxy->vps;
2147                         request->proxy->vps = vp;
2148                 }
2149                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2150                        sizeof(vp->vp_strvalue));
2151                 vp->length = strippedname->length;
2152
2153                 /*
2154                  *      Do NOT delete Stripped-User-Name.
2155                  */
2156         }
2157
2158         /*
2159          *      If there is no PW_CHAP_CHALLENGE attribute but
2160          *      there is a PW_CHAP_PASSWORD we need to add it
2161          *      since we can't use the request authenticator
2162          *      anymore - we changed it.
2163          */
2164         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2165             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2166             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2167                 vp = radius_paircreate(request, &request->proxy->vps,
2168                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2169                 vp->length = AUTH_VECTOR_LEN;
2170                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2171         }
2172
2173         /*
2174          *      The RFC's say we have to do this, but FreeRADIUS
2175          *      doesn't need it.
2176          */
2177         vp = radius_paircreate(request, &request->proxy->vps,
2178                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2179         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2180                  request->packet->id);
2181         vp->length = strlen(vp->vp_strvalue);
2182
2183         /*
2184          *      Should be done BEFORE inserting into proxy hash, as
2185          *      pre-proxy may use this information, or change it.
2186          */
2187         request->proxy->code = request->packet->code;
2188
2189         /*
2190          *      Call the pre-proxy routines.
2191          */
2192         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2193         if (vp) {
2194                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2195                 pre_proxy_type = vp->vp_integer;
2196         }
2197
2198         rad_assert(request->home_pool != NULL);
2199
2200         if (request->home_pool->virtual_server) {
2201                 const char *old_server = request->server;
2202
2203                 request->server = request->home_pool->virtual_server;
2204                 RDEBUG2(" server %s {", request->server);
2205                 rcode = module_pre_proxy(pre_proxy_type, request);
2206                 RDEBUG2(" }");
2207                         request->server = old_server;
2208         } else {
2209                 rcode = module_pre_proxy(pre_proxy_type, request);
2210         }
2211         switch (rcode) {
2212         case RLM_MODULE_FAIL:
2213         case RLM_MODULE_INVALID:
2214         case RLM_MODULE_NOTFOUND:
2215         case RLM_MODULE_USERLOCK:
2216         default:
2217                 /* FIXME: debug print failed stuff */
2218                 return -1;
2219
2220         case RLM_MODULE_REJECT:
2221         case RLM_MODULE_HANDLED:
2222                 return 0;
2223
2224         /*
2225          *      Only proxy the packet if the pre-proxy code succeeded.
2226          */
2227         case RLM_MODULE_NOOP:
2228         case RLM_MODULE_OK:
2229         case RLM_MODULE_UPDATED:
2230                 break;
2231         }
2232
2233         /*
2234          *      If it's a fake request, don't send the proxy
2235          *      packet.  The outer tunnel session will take
2236          *      care of doing that.
2237          */
2238         if (request->packet->dst_port == 0) {
2239                 request->home_server = NULL;
2240                 return 1;
2241         }
2242
2243         if (request->home_server->server) {
2244                 return proxy_to_virtual_server(request);
2245         }
2246
2247         if (!proxy_request(request)) {
2248                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2249                 return -1;
2250         }
2251
2252         return 1;
2253 }
2254 #endif
2255
2256 static void request_post_handler(REQUEST *request)
2257 {
2258         int child_state = -1;
2259         struct timeval when;
2260         VALUE_PAIR *vp;
2261
2262         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2263             (request->parent &&
2264              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2265                 RDEBUG2("Request %d was cancelled.", request->number);
2266 #ifdef HAVE_PTHREAD_H
2267                 request->child_pid = NO_SUCH_CHILD_PID;
2268 #endif
2269                 child_state = REQUEST_DONE;
2270                 goto cleanup;
2271         }
2272
2273         if (request->child_state != REQUEST_RUNNING) {
2274                 rad_panic("Internal sanity check failed");
2275         }
2276
2277 #ifdef WITH_COA
2278         /*
2279          *      If it's not in the request hash, it's a CoA request.
2280          *      We hope.
2281          */
2282         if (!request->in_request_hash &&
2283             request->proxy &&
2284             ((request->proxy->code == PW_COA_REQUEST) ||
2285              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2286                 request->next_callback = NULL;
2287                 child_state = REQUEST_DONE;
2288                 goto cleanup;
2289         }
2290 #endif
2291
2292         if ((request->reply->code == 0) &&
2293             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2294             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2295                 request->reply->code = PW_AUTHENTICATION_REJECT;
2296         }
2297
2298 #ifdef WITH_PROXY
2299         if (request->root->proxy_requests &&
2300             !request->in_proxy_hash &&
2301             (request->reply->code == 0) &&
2302             (request->packet->dst_port != 0) &&
2303             (request->packet->code != PW_STATUS_SERVER)) {
2304                 int rcode = successfully_proxied_request(request);
2305
2306                 if (rcode == 1) return; /* request is invalid */
2307
2308                 /*
2309                  *      Failed proxying it (dead home servers, etc.)
2310                  *      Run it through Post-Proxy-Type = Fail, and
2311                  *      respond to the request.
2312                  *
2313                  *      Note that we're in a child thread here, so we
2314                  *      do NOT re-schedule the request.  Instead, we
2315                  *      do what we would have done, which is run the
2316                  *      pre-handler, a NULL request handler, and then
2317                  *      the post handler.
2318                  */
2319                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2320                         request_pre_handler(request);
2321                 }
2322
2323                 /*
2324                  *      Else we weren't supposed to proxy it,
2325                  *      OR we proxied it internally to a virutal server.
2326                  */
2327         }
2328 #endif
2329
2330         /*
2331          *      Fake requests don't get encoded or signed.  The caller
2332          *      also requires the reply VP's, so we don't free them
2333          *      here!
2334          */
2335         if (request->packet->dst_port == 0) {
2336                 /* FIXME: RDEBUG going to the next request */
2337 #ifdef HAVE_PTHREAD_H
2338                 request->child_pid = NO_SUCH_CHILD_PID;
2339 #endif
2340                 request->child_state = REQUEST_DONE;
2341                 return;
2342         }
2343
2344 #ifdef WITH_PROXY
2345         /*
2346          *      Copy Proxy-State from the request to the reply.
2347          */
2348         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2349         if (vp) pairadd(&request->reply->vps, vp);
2350 #endif
2351
2352         /*
2353          *      Access-Requests get delayed or cached.
2354          */
2355         switch (request->packet->code) {
2356         case PW_AUTHENTICATION_REQUEST:
2357                 gettimeofday(&request->next_when, NULL);
2358
2359                 if (request->reply->code == 0) {
2360                         /*
2361                          *      Check if the lack of response is intentional.
2362                          */
2363                         vp = pairfind(request->config_items,
2364                                       PW_RESPONSE_PACKET_TYPE);
2365                         if (!vp) {
2366                                 RDEBUG2("There was no response configured: rejecting request %d",
2367                                        request->number);
2368                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2369
2370                         } else if (vp->vp_integer == 256) {
2371                                 RDEBUG2("Not responding to request %d",
2372                                        request->number);
2373
2374                                 /*
2375                                  *      Force cleanup after a long
2376                                  *      time, so that we don't
2377                                  *      re-process the packet.
2378                                  */
2379                                 request->next_when.tv_sec += request->root->max_request_time;
2380                                 request->next_callback = cleanup_delay;
2381                                 child_state = REQUEST_CLEANUP_DELAY;
2382                                 break;
2383                         } else {
2384                                 request->reply->code = vp->vp_integer;
2385
2386                         }
2387                 }
2388
2389                 /*
2390                  *      Run rejected packets through
2391                  *
2392                  *      Post-Auth-Type = Reject
2393                  */
2394                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2395                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2396                         vp = radius_pairmake(request, &request->config_items,
2397                                              "Post-Auth-Type", "Reject",
2398                                              T_OP_SET);
2399                         if (vp) rad_postauth(request);
2400
2401                         /*
2402                          *      If configured, delay Access-Reject packets.
2403                          *
2404                          *      If request->root->reject_delay = 0, we discover
2405                          *      that we have to send the packet now.
2406                          */
2407                         when = request->received;
2408                         when.tv_sec += request->root->reject_delay;
2409
2410                         if (timercmp(&when, &request->next_when, >)) {
2411                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2412                                        request->number,
2413                                        request->root->reject_delay);
2414                                 request->next_when = when;
2415                                 request->next_callback = reject_delay;
2416 #ifdef HAVE_PTHREAD_H
2417                                 request->child_pid = NO_SUCH_CHILD_PID;
2418 #endif
2419                                 request->child_state = REQUEST_REJECT_DELAY;
2420                                 return;
2421                         }
2422                 }
2423
2424 #ifdef WITH_COA
2425         case PW_COA_REQUEST:
2426         case PW_DISCONNECT_REQUEST:
2427 #endif
2428                 request->next_when.tv_sec += request->root->cleanup_delay;
2429                 request->next_callback = cleanup_delay;
2430                 child_state = REQUEST_CLEANUP_DELAY;
2431                 break;
2432
2433         case PW_ACCOUNTING_REQUEST:
2434                 request->next_callback = NULL; /* just to be safe */
2435                 child_state = REQUEST_DONE;
2436                 break;
2437
2438                 /*
2439                  *      FIXME: Status-Server should probably not be
2440                  *      handled here...
2441                  */
2442         case PW_STATUS_SERVER:
2443                 request->next_callback = NULL;
2444                 child_state = REQUEST_DONE;
2445                 break;
2446
2447         default:
2448                 if ((request->packet->code > 1024) &&
2449                     (request->packet->code < (1024 + 254 + 1))) {
2450                         request->next_callback = NULL;
2451                         child_state = REQUEST_DONE;
2452                         break;
2453                 }
2454
2455                 radlog(L_ERR, "Unknown packet type %d", request->packet->code);
2456                 request->next_callback = NULL;
2457                 child_state = REQUEST_DONE;
2458                 break;
2459         }
2460
2461         /*
2462          *      Suppress "no reply" packets here, unless we're reading
2463          *      from the "detail" file.  In that case, we've got to
2464          *      tell the detail file handler that the request is dead,
2465          *      and it should re-send it.
2466          *      If configured, encode, sign, and send.
2467          */
2468         if ((request->reply->code != 0) ||
2469             (request->listener->type == RAD_LISTEN_DETAIL)) {
2470                 DEBUG_PACKET(request, request->reply, 1);
2471                 request->listener->send(request->listener, request);
2472         }
2473
2474 #ifdef WITH_COA
2475         /*
2476          *      Now that we've completely processed the request,
2477          *      see if we need to originate a CoA request.
2478          */
2479         if (request->coa ||
2480             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2481                 if (!originated_coa_request(request)) {
2482                         RDEBUG2("Do CoA Fail handler here");
2483                 }
2484                 /* request->coa is stil set, so we can update events */
2485         }
2486 #endif
2487
2488  cleanup:
2489         /*
2490          *      Clean up.  These are no longer needed.
2491          */
2492         pairfree(&request->config_items);
2493
2494         pairfree(&request->packet->vps);
2495         request->username = NULL;
2496         request->password = NULL;
2497
2498         pairfree(&request->reply->vps);
2499
2500 #ifdef WITH_PROXY
2501         if (request->proxy) {
2502                 pairfree(&request->proxy->vps);
2503
2504                 if (request->proxy_reply) {
2505                         pairfree(&request->proxy_reply->vps);
2506                 }
2507
2508 #if 0
2509                 /*
2510                  *      We're not tracking responses from the home
2511                  *      server, we can therefore free this memory in
2512                  *      the child thread.
2513                  */
2514                 if (!request->in_proxy_hash) {
2515                         rad_free(&request->proxy);
2516                         rad_free(&request->proxy_reply);
2517                         request->home_server = NULL;
2518                 }
2519 #endif
2520         }
2521 #endif
2522
2523         RDEBUG2("Finished request %d.", request->number);
2524         rad_assert(child_state >= 0);
2525         request->child_state = child_state;
2526
2527         /*
2528          *      Single threaded mode: update timers now.
2529          */
2530         if (!have_children) wait_a_bit(request);
2531 }
2532
2533
2534 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2535 {
2536 #ifdef WITH_PROXY
2537         char buffer[128];
2538 #endif
2539
2540         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2541         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2542
2543         switch (request->child_state) {
2544         case REQUEST_QUEUED:
2545         case REQUEST_RUNNING:
2546 #ifdef WITH_PROXY
2547         discard:
2548 #endif
2549                 radlog(L_ERR, "Discarding duplicate request from "
2550                        "client %s port %d - ID: %d due to unfinished request %d",
2551                        client->shortname,
2552                        request->packet->src_port,request->packet->id,
2553                        request->number);
2554                 break;
2555
2556 #ifdef WITH_PROXY
2557         case REQUEST_PROXIED:
2558                 /*
2559                  *      We're not supposed to have duplicate
2560                  *      accounting packets.  The other states handle
2561                  *      duplicates fine (discard, or send duplicate
2562                  *      reply).  But we do NOT want to retransmit an
2563                  *      accounting request here, because that would
2564                  *      involve updating the Acct-Delay-Time, and
2565                  *      therefore changing the packet Id, etc.
2566                  *
2567                  *      Instead, we just discard the packet.  We may
2568                  *      eventually respond, or the client will send a
2569                  *      new accounting packet.
2570                  *
2571                  *      The same comments go for Status-Server, and
2572                  *      other packet types.
2573                  *
2574                  *      FIXME: coa: when we proxy CoA && Disconnect
2575                  *      packets, this logic has to be fixed.
2576                  */
2577                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2578                         goto discard;
2579                 }
2580
2581                 check_for_zombie_home_server(request);
2582
2583                 /*
2584                  *      If we've just discovered that the home server is
2585                  *      dead, send the packet to another one.
2586                  */
2587                 if ((request->packet->dst_port != 0) &&
2588                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
2589                         home_server *home;
2590
2591                         remove_from_proxy_hash(request);
2592
2593                         home = home_server_ldb(NULL, request->home_pool, request);
2594                         if (!home) {
2595                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2596                         no_home_servers:
2597                                 /*
2598                                  *      Do post-request processing,
2599                                  *      and any insertion of necessary
2600                                  *      events.
2601                                  */
2602                                 post_proxy_fail_handler(request);
2603                                 return;
2604                         }
2605
2606                         request->proxy->code = request->packet->code;
2607
2608                         /*
2609                          *      Free the old packet, to force re-encoding
2610                          */
2611                         free(request->proxy->data);
2612                         request->proxy->data = NULL;
2613                         request->proxy->data_len = 0;
2614
2615                         /*
2616                          *      This request failed over to a virtual
2617                          *      server.  Push it back onto the queue
2618                          *      to be processed.
2619                          */
2620                         if (request->home_server->server) {
2621                                 proxy_fallback_handler(request);
2622                                 return;
2623                         }
2624
2625                         /*
2626                          *      Try to proxy the request.
2627                          */
2628                         if (!proxy_request(request)) {
2629                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2630                                 goto no_home_servers;
2631                         }
2632
2633                         /*
2634                          *      This code executes in the main server
2635                          *      thread, so there's no need for locking.
2636                          */
2637                         rad_assert(request->next_callback != NULL);
2638                         INSERT_EVENT(request->next_callback, request);
2639                         request->next_callback = NULL;
2640                         return;
2641                 } /* else the home server is still alive */
2642
2643                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2644                        inet_ntop(request->proxy->dst_ipaddr.af,
2645                                  &request->proxy->dst_ipaddr.ipaddr,
2646                                  buffer, sizeof(buffer)),
2647                        request->proxy->dst_port,
2648                        request->proxy->id);
2649                 request->num_proxied_requests++;
2650
2651                 DEBUG_PACKET(request, request->proxy, 1);
2652                 request->proxy_listener->send(request->proxy_listener,
2653                                               request);
2654                 break;
2655 #endif
2656
2657         case REQUEST_REJECT_DELAY:
2658                 RDEBUG2("Waiting to send Access-Reject "
2659                        "to client %s port %d - ID: %d",
2660                        client->shortname,
2661                        request->packet->src_port, request->packet->id);
2662                 break;
2663
2664         case REQUEST_CLEANUP_DELAY:
2665         case REQUEST_DONE:
2666                 if (request->reply->code == 0) {
2667                         RDEBUG2("Ignoring retransmit from client %s port %d "
2668                                 "- ID: %d, no reply was configured",
2669                                 client->shortname,
2670                                 request->packet->src_port, request->packet->id);
2671                         return;
2672                 }
2673
2674                 /*
2675                  *      FIXME: This sends duplicate replies to
2676                  *      accounting requests, even if Acct-Delay-Time
2677                  *      or Event-Timestamp is in the packet.  In those
2678                  *      cases, the Id should be changed, and the packet
2679                  *      re-calculated.
2680                  */
2681                 RDEBUG2("Sending duplicate reply "
2682                        "to client %s port %d - ID: %d",
2683                        client->shortname,
2684                        request->packet->src_port, request->packet->id);
2685                 DEBUG_PACKET(request, request->reply, 1);
2686                 request->listener->send(request->listener, request);
2687                 break;
2688         }
2689 }
2690
2691
2692 static void received_conflicting_request(REQUEST *request,
2693                                          const RADCLIENT *client)
2694 {
2695         radlog(L_ERR, "Received conflicting packet from "
2696                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2697                client->shortname,
2698                request->packet->src_port, request->packet->id,
2699                request->number);
2700
2701         /*
2702          *      Nuke it from the request hash, so we can receive new
2703          *      packets.
2704          */
2705         remove_from_request_hash(request);
2706
2707         switch (request->child_state) {
2708 #ifdef HAVE_PTHREAD_H
2709                 /*
2710                  *      It's queued or running.  Tell it to stop, and
2711                  *      wait for it to do so.
2712                  */
2713         case REQUEST_QUEUED:
2714         case REQUEST_RUNNING:
2715                 request->master_state = REQUEST_STOP_PROCESSING;
2716                 request->delay += request->delay >> 1;
2717
2718                 tv_add(&request->when, request->delay);
2719
2720                 INSERT_EVENT(wait_for_child_to_die, request);
2721                 return;
2722 #endif
2723
2724                 /*
2725                  *      Catch race conditions.  It may have switched
2726                  *      from running to done while this code is being
2727                  *      executed.
2728                  */
2729         case REQUEST_REJECT_DELAY:
2730         case REQUEST_CLEANUP_DELAY:
2731         case REQUEST_DONE:
2732                 break;
2733
2734                 /*
2735                  *      It's in some other state, and therefore also
2736                  *      in the event queue.  At some point, the
2737                  *      child will notice, and we can then delete it.
2738                  */
2739         case REQUEST_PROXIED:
2740         default:
2741                 rad_assert(request->ev != NULL);
2742                 break;
2743         }
2744 }
2745
2746
2747 static int can_handle_new_request(RADIUS_PACKET *packet,
2748                                   RADCLIENT *client,
2749                                   struct main_config_t *root)
2750 {
2751         /*
2752          *      Count the total number of requests, to see if
2753          *      there are too many.  If so, return with an
2754          *      error.
2755          */
2756         if (root->max_requests) {
2757                 int request_count = fr_packet_list_num_elements(pl);
2758
2759                 /*
2760                  *      This is a new request.  Let's see if
2761                  *      it makes us go over our configured
2762                  *      bounds.
2763                  */
2764                 if (request_count > root->max_requests) {
2765                         radlog(L_ERR, "Dropping request (%d is too many): "
2766                                "from client %s port %d - ID: %d", request_count,
2767                                client->shortname,
2768                                packet->src_port, packet->id);
2769                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2770                                "\tThe value for 'max_requests' is probably set too low.\n");
2771                         return 0;
2772                 } /* else there were a small number of requests */
2773         } /* else there was no configured limit for requests */
2774
2775         /*
2776          *      FIXME: Add per-client checks.  If one client is sending
2777          *      too many packets, start discarding them.
2778          *
2779          *      We increment the counters here, and decrement them
2780          *      when the response is sent... somewhere in this file.
2781          */
2782
2783         /*
2784          *      FUTURE: Add checks for system load.  If the system is
2785          *      busy, start dropping requests...
2786          *
2787          *      We can probably keep some statistics ourselves...  if
2788          *      there are more requests coming in than we can handle,
2789          *      start dropping some.
2790          */
2791
2792         return 1;
2793 }
2794
2795
2796 int received_request(rad_listen_t *listener,
2797                      RADIUS_PACKET *packet, REQUEST **prequest,
2798                      RADCLIENT *client)
2799 {
2800         RADIUS_PACKET **packet_p;
2801         REQUEST *request = NULL;
2802         struct main_config_t *root = &mainconfig;
2803
2804         packet_p = fr_packet_list_find(pl, packet);
2805         if (packet_p) {
2806                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2807                 rad_assert(request->in_request_hash);
2808
2809                 if ((request->packet->data_len == packet->data_len) &&
2810                     (memcmp(request->packet->vector, packet->vector,
2811                             sizeof(packet->vector)) == 0)) {
2812                         received_retransmit(request, client);
2813                         return 0;
2814                 }
2815
2816                 /*
2817                  *      The new request is different from the old one,
2818                  *      but maybe the old is finished.  If so, delete
2819                  *      the old one.
2820                  */
2821                 switch (request->child_state) {
2822                         struct timeval when;
2823
2824                 default:
2825                         /*
2826                          *      Special hacks for race conditions.
2827                          *      The reply is encoded, and therefore
2828                          *      likely sent.  We received a *new*
2829                          *      packet from the client, likely before
2830                          *      the next line or two of code which
2831                          *      updated the child state.  In this
2832                          *      case, just accept the new request.
2833                          */
2834                         if ((request->reply->code != 0) &&
2835                             request->reply->data) {
2836                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2837                                        client->shortname,
2838                                        packet->src_port, packet->id,
2839                                        request->number);
2840                                 remove_from_request_hash(request);
2841                                 request = NULL;
2842                                 break;
2843                         }
2844
2845                         gettimeofday(&when, NULL);
2846                         when.tv_sec -= 1;
2847
2848                         /*
2849                          *      If the cached request was received
2850                          *      within the last second, then we
2851                          *      discard the NEW request instead of the
2852                          *      old one.  This will happen ONLY when
2853                          *      the client is severely broken, and is
2854                          *      sending conflicting packets very
2855                          *      quickly.
2856                          */
2857                         if (timercmp(&when, &request->received, <)) {
2858                                 radlog(L_ERR, "Discarding conflicting packet from "
2859                                        "client %s port %d - ID: %d due to recent request %d.",
2860                                        client->shortname,
2861                                        packet->src_port, packet->id,
2862                                        request->number);
2863                                 return 0;
2864                         }
2865
2866                         received_conflicting_request(request, client);
2867                         request = NULL;
2868                         break;
2869
2870                 case REQUEST_REJECT_DELAY:
2871                 case REQUEST_CLEANUP_DELAY:
2872                         request->child_state = REQUEST_DONE;
2873                 case REQUEST_DONE:
2874                         cleanup_delay(request);
2875                         request = NULL;
2876                         break;
2877                 }
2878         }
2879
2880         /*
2881          *      We may want to quench the new request.
2882          */
2883         if ((listener->type != RAD_LISTEN_DETAIL) &&
2884             !can_handle_new_request(packet, client, root)) {
2885                 return 0;
2886         }
2887
2888         /*
2889          *      Create and initialize the new request.
2890          */
2891         request = request_alloc(); /* never fails */
2892
2893         if ((request->reply = rad_alloc(0)) == NULL) {
2894                 radlog(L_ERR, "No memory");
2895                 exit(1);
2896         }
2897
2898         request->listener = listener;
2899         request->client = client;
2900         request->packet = packet;
2901         request->packet->timestamp = request->timestamp;
2902         request->number = request_num_counter++;
2903         request->priority = listener->type;
2904 #ifdef HAVE_PTHREAD_H
2905         request->child_pid = NO_SUCH_CHILD_PID;
2906 #endif
2907
2908         /*
2909          *      Status-Server packets go to the head of the queue.
2910          */
2911         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2912
2913         /*
2914          *      Set virtual server identity
2915          */
2916         if (client->server) {
2917                 request->server = client->server;
2918         } else if (listener->server) {
2919                 request->server = listener->server;
2920         } else {
2921                 request->server = NULL;
2922         }
2923
2924         /*
2925          *      Remember the request in the list.
2926          */
2927         if (!fr_packet_list_insert(pl, &request->packet)) {
2928                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2929                 ev_request_free(&request);
2930                 return 0;
2931         }
2932
2933         request->in_request_hash = TRUE;
2934         request->root = root;
2935         root->refcount++;
2936
2937         /*
2938          *      The request passes many of our sanity checks.
2939          *      From here on in, if anything goes wrong, we
2940          *      send a reject message, instead of dropping the
2941          *      packet.
2942          */
2943
2944         /*
2945          *      Build the reply template from the request.
2946          */
2947
2948         request->reply->sockfd = request->packet->sockfd;
2949         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2950         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2951         request->reply->dst_port = request->packet->src_port;
2952         request->reply->src_port = request->packet->dst_port;
2953         request->reply->id = request->packet->id;
2954         request->reply->code = 0; /* UNKNOWN code */
2955         memcpy(request->reply->vector, request->packet->vector,
2956                sizeof(request->reply->vector));
2957         request->reply->vps = NULL;
2958         request->reply->data = NULL;
2959         request->reply->data_len = 0;
2960
2961         request->master_state = REQUEST_ACTIVE;
2962         request->child_state = REQUEST_QUEUED;
2963         request->next_callback = NULL;
2964
2965         gettimeofday(&request->received, NULL);
2966         request->timestamp = request->received.tv_sec;
2967         request->when = request->received;
2968
2969         request->delay = USEC;
2970
2971         tv_add(&request->when, request->delay);
2972
2973         INSERT_EVENT(wait_a_bit, request);
2974
2975         *prequest = request;
2976         return 1;
2977 }
2978
2979
2980 #ifdef WITH_PROXY
2981 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
2982 {
2983         char            buffer[128];
2984         REQUEST         *request;
2985
2986         /*
2987          *      Also removes from the proxy hash if responses == requests
2988          */
2989         request = lookup_in_proxy_hash(packet);
2990
2991         if (!request) {
2992                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
2993                        inet_ntop(packet->src_ipaddr.af,
2994                                  &packet->src_ipaddr.ipaddr,
2995                                  buffer, sizeof(buffer)),
2996                        packet->src_port, packet->id);
2997                 return NULL;
2998         }
2999
3000         /*
3001          *      We haven't replied to the NAS, but we have seen an
3002          *      earlier reply from the home server.  Ignore this packet,
3003          *      as we're likely still processing the previous reply.
3004          */
3005         if (request->proxy_reply) {
3006                 if (memcmp(request->proxy_reply->vector,
3007                            packet->vector,
3008                            sizeof(request->proxy_reply->vector)) == 0) {
3009                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
3010                                inet_ntop(packet->src_ipaddr.af,
3011                                          &packet->src_ipaddr.ipaddr,
3012                                          buffer, sizeof(buffer)),
3013                                packet->src_port, packet->id,
3014                                request->number);
3015                 } else {
3016                         /*
3017                          *      ? The home server gave us a new proxy
3018                          *      reply which doesn't match the old
3019                          *      one.  Delete it.
3020                          */
3021                         RDEBUG2("Ignoring conflicting proxy reply");
3022                 }
3023
3024                 /* assert that there's an event queued for request? */
3025                 return NULL;
3026         }
3027
3028         /*
3029          *      Verify the packet before doing ANYTHING with it.  This
3030          *      means we're doing more MD5 checks in the server core.
3031          *      However, we can fix that by moving to multiple threads
3032          *      listening on sockets.
3033          *
3034          *      We do this AFTER looking the request up in the hash,
3035          *      and AFTER vhecking if we saw a previous request.  This
3036          *      helps minimize the DoS effect of people attacking us
3037          *      with spoofed packets.
3038          */
3039         if (rad_verify(packet, request->proxy,
3040                        request->home_server->secret) != 0) {
3041                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3042                 return NULL;
3043         }
3044
3045         gettimeofday(&now, NULL);
3046
3047         /*
3048          *      Maybe move this earlier in the decision process?
3049          *      Having it here means that late or duplicate proxy
3050          *      replies no longer get the home server marked as
3051          *      "alive".  This might be good for stability, though.
3052          *
3053          *      FIXME: Do we really want to do this whenever we
3054          *      receive a packet?  Setting this here means that we
3055          *      mark it alive on *any* packet, even if it's lost all
3056          *      of the *other* packets in the last 10s.
3057          */
3058         request->home_server->state = HOME_STATE_ALIVE;
3059
3060 #ifdef WITH_COA
3061         /*
3062          *      When originating CoA, the "proxy" reply is the reply
3063          *      to the CoA request that we originated.  At this point,
3064          *      the original request is finished, and it has a reply.
3065          *
3066          *      However, if we haven't separated the two requests, do
3067          *      so now.  This is done so that cleaning up the original
3068          *      request won't cause the CoA request to be free'd.  See
3069          *      util.c, request_free()
3070          */
3071         if (request->parent && (request->parent->coa == request)) {
3072                 request->parent->coa = NULL;
3073                 request->parent = NULL;
3074
3075         } else
3076                 /*
3077                  *      Skip the next set of checks, as the original
3078                  *      reply is cached.  We want to be able to still
3079                  *      process the CoA reply, AND to reference the
3080                  *      original request/reply.
3081                  *
3082                  *      This is getting to be really quite a bit of a
3083                  *      hack.
3084                  */
3085 #endif
3086
3087         /*
3088          *      If there's a reply to the NAS, ignore everything
3089          *      related to proxy responses
3090          */
3091         if (request->reply && request->reply->code != 0) {
3092                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3093                 return NULL;
3094         }
3095
3096 #ifdef WITH_STATS
3097         /*
3098          *      The average includes our time to receive packets and
3099          *      look them up in the hashes, which should be the same
3100          *      for all packets.
3101          *
3102          *      We update the response time only for the FIRST packet
3103          *      we receive.
3104          */
3105         if (request->home_server->ema.window > 0) {
3106                 radius_stats_ema(&request->home_server->ema,
3107                                  &now, &request->proxy_when);
3108         }
3109 #endif
3110
3111         switch (request->child_state) {
3112         case REQUEST_QUEUED:
3113         case REQUEST_RUNNING:
3114                 radlog(L_ERR, "Internal sanity check failed for child state");
3115                 /* FALL-THROUGH */
3116
3117         case REQUEST_REJECT_DELAY:
3118         case REQUEST_CLEANUP_DELAY:
3119         case REQUEST_DONE:
3120                 radlog(L_ERR, "Reply from home server %s port %d  - ID: %d arrived too late for request %d. Try increasing 'retry_delay' or 'max_request_time'",
3121                        inet_ntop(packet->src_ipaddr.af,
3122                                  &packet->src_ipaddr.ipaddr,
3123                                  buffer, sizeof(buffer)),
3124                        packet->src_port, packet->id,
3125                        request->number);
3126                 /* assert that there's an event queued for request? */
3127                 return NULL;
3128
3129         case REQUEST_PROXIED:
3130                 break;
3131         }
3132
3133         request->proxy_reply = packet;
3134
3135 #if 0
3136         /*
3137          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3138          *      Note that we only do so on the first response.
3139          */
3140         if ((request->num_proxied_responses == 1)
3141                 int rtt;
3142                 home_server *home = request->home_server;
3143
3144                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3145                 rtt *= USEC;
3146                 rtt += now.tv_usec;
3147                 rtt -= request->proxy_when.tv_usec;
3148
3149                 if (!home->has_rtt) {
3150                         home->has_rtt = TRUE;
3151
3152                         home->srtt = rtt;
3153                         home->rttvar = rtt / 2;
3154
3155                 } else {
3156                         home->rttvar -= home->rttvar >> 2;
3157                         home->rttvar += (home->srtt - rtt);
3158                         home->srtt -= home->srtt >> 3;
3159                         home->srtt += rtt >> 3;
3160                 }
3161
3162                 home->rto = home->srtt;
3163                 if (home->rttvar > (USEC / 4)) {
3164                         home->rto += home->rttvar * 4;
3165                 } else {
3166                         home->rto += USEC;
3167                 }
3168         }
3169 #endif
3170
3171         /*
3172          *      There's no incoming request, so it's a proxied packet
3173          *      we originated.
3174          */
3175         if (!request->packet) {
3176                 received_response_to_ping(request);
3177                 request->proxy_reply = NULL; /* caller will free it */
3178                 ev_request_free(&request);
3179                 return NULL;
3180         }
3181
3182         request->child_state = REQUEST_QUEUED;
3183         request->when = now;
3184         request->delay = USEC;
3185         request->priority = RAD_LISTEN_PROXY;
3186         tv_add(&request->when, request->delay);
3187
3188         /*
3189          *      Wait a bit will take care of max_request_time
3190          */
3191         INSERT_EVENT(wait_a_bit, request);
3192
3193         return request;
3194 }
3195 #endif
3196
3197 void event_new_fd(rad_listen_t *this)
3198 {
3199         char buffer[1024];
3200
3201         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3202
3203         this->print(this, buffer, sizeof(buffer));
3204
3205         if (this->status == RAD_LISTEN_STATUS_INIT) {
3206                 if (just_started) {
3207                         DEBUG("Listening on %s", buffer);
3208                 } else {
3209                         DEBUG2(" ... adding new socket %s", buffer);
3210                 }
3211                 if (!fr_event_fd_insert(el, 0, this->fd,
3212                                         event_socket_handler, this)) {
3213                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3214                         exit(1);
3215                 }
3216
3217                 this->status = RAD_LISTEN_STATUS_KNOWN;
3218                 return;
3219         }
3220
3221         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3222                 DEBUG2(" ... closing socket %s", buffer);
3223
3224                 fr_event_fd_delete(el, 0, this->fd);
3225                 this->status = RAD_LISTEN_STATUS_FINISH;
3226
3227                 /*
3228                  *      Close the fd AFTER fixing up the requests and
3229                  *      listeners, so that they don't send/recv on the
3230                  *      wrong socket (if someone manages to open
3231                  *      another one).
3232                  */
3233                 close(this->fd);
3234                 this->fd = -1;
3235         }
3236 }
3237
3238 static void handle_signal_self(int flag)
3239 {
3240         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3241                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3242                         fr_event_loop_exit(el, 1);
3243                 } else {
3244                         fr_event_loop_exit(el, 2);
3245                 }
3246
3247                 return;
3248         } /* else exit/term flags weren't set */
3249
3250         /*
3251          *      Tell the even loop to stop processing.
3252          */
3253         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3254                 time_t when;
3255                 static time_t last_hup = 0;
3256
3257                 DEBUG("Received HUP signal.");
3258
3259                 when = time(NULL);
3260                 if ((int) (when - last_hup) < 5) {
3261                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3262                         return;
3263                 }
3264                 last_hup = when;
3265
3266                 fr_event_loop_exit(el, 0x80);
3267         }
3268
3269 #ifdef WITH_DETAIL
3270         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3271                 rad_listen_t *this;
3272
3273                 /*
3274                  *      FIXME: O(N) loops suck.
3275                  */
3276                 for (this = mainconfig.listen;
3277                      this != NULL;
3278                      this = this->next) {
3279                         if (this->type != RAD_LISTEN_DETAIL) continue;
3280
3281                         /*
3282                          *      This one didn't send the signal, skip
3283                          *      it.
3284                          */
3285                         if (!this->decode(this, NULL)) continue;
3286
3287                         /*
3288                          *      Go service the interrupt.
3289                          */
3290                         event_poll_detail(this);
3291                 }
3292         }
3293 #endif
3294
3295         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3296                 rad_listen_t *this;
3297
3298                 for (this = mainconfig.listen;
3299                      this != NULL;
3300                      this = this->next) {
3301                         event_new_fd(this);
3302                 }
3303         }
3304 }
3305
3306 #ifndef WITH_SELF_PIPE
3307 void radius_signal_self(int flag)
3308 {
3309         handle_signal_self(flag);
3310 }
3311 #else
3312 /*
3313  *      Inform ourselves that we received a signal.
3314  */
3315 void radius_signal_self(int flag)
3316 {
3317         ssize_t rcode;
3318         uint8_t buffer[16];
3319
3320         /*
3321          *      The read MUST be non-blocking for this to work.
3322          */
3323         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3324         if (rcode > 0) {
3325                 ssize_t i;
3326
3327                 for (i = 0; i < rcode; i++) {
3328                         buffer[0] |= buffer[i];
3329                 }
3330         } else {
3331                 buffer[0] = 0;
3332         }
3333
3334         buffer[0] |= flag;
3335
3336         write(self_pipe[1], buffer, 1);
3337 }
3338
3339
3340 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3341                                  UNUSED int fd, UNUSED void *ctx)
3342 {
3343         ssize_t i, rcode;
3344         uint8_t buffer[32];
3345
3346         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3347         if (rcode <= 0) return;
3348
3349         /*
3350          *      Merge pending signals.
3351          */
3352         for (i = 0; i < rcode; i++) {
3353                 buffer[0] |= buffer[i];
3354         }
3355
3356         handle_signal_self(buffer[0]);
3357 }
3358 #endif
3359
3360
3361 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3362                                  void *ctx)
3363 {
3364         rad_listen_t *listener = ctx;
3365         RAD_REQUEST_FUNP fun;
3366         REQUEST *request;
3367
3368         rad_assert(xel == el);
3369
3370         xel = xel;
3371
3372         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3373
3374         if (!listener->recv(listener, &fun, &request)) return;
3375
3376         if (!thread_pool_addrequest(request, fun)) {
3377                 request->child_state = REQUEST_DONE;
3378         }
3379 }
3380
3381 typedef struct listen_detail_t {
3382         fr_event_t      *ev;
3383 } listen_detail_t;
3384
3385 /*
3386  *      This function is called periodically to see if this detail
3387  *      file is available for reading.
3388  */
3389 static void event_poll_detail(void *ctx)
3390 {
3391         int rcode, delay;
3392         RAD_REQUEST_FUNP fun;
3393         REQUEST *request;
3394         rad_listen_t *this = ctx;
3395         struct timeval when;
3396         listen_detail_t *detail = this->data;
3397
3398         rad_assert(this->type == RAD_LISTEN_DETAIL);
3399
3400         /*
3401          *      Try to read something.
3402          *
3403          *      FIXME: This does poll AND receive.
3404          */
3405         rcode = this->recv(this, &fun, &request);
3406         if (rcode != 0) {
3407                 rad_assert(fun != NULL);
3408                 rad_assert(request != NULL);
3409
3410                 if (!thread_pool_addrequest(request, fun)) {
3411                         request->child_state = REQUEST_DONE;
3412                 }
3413         }
3414
3415         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3416         when = now;
3417
3418         /*
3419          *      Backdoor API to get the delay until the next poll
3420          *      time.
3421          */
3422         delay = this->encode(this, NULL);
3423         tv_add(&when, delay);
3424
3425         if (!fr_event_insert(el, event_poll_detail, this,
3426                              &when, &detail->ev)) {
3427                 radlog(L_ERR, "Failed creating handler");
3428                 exit(1);
3429         }
3430 }
3431
3432
3433 static void event_status(struct timeval *wake)
3434 {
3435 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3436         int argval;
3437 #endif
3438
3439         if (debug_flag == 0) {
3440                 if (just_started) {
3441                         radlog(L_INFO, "Ready to process requests.");
3442                         just_started = FALSE;
3443                 }
3444                 return;
3445         }
3446
3447         if (!wake) {
3448                 DEBUG("Ready to process requests.");
3449
3450         } else if ((wake->tv_sec != 0) ||
3451                    (wake->tv_usec >= 100000)) {
3452                 DEBUG("Waking up in %d.%01u seconds.",
3453                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3454         }
3455
3456
3457         /*
3458          *      FIXME: Put this somewhere else, where it isn't called
3459          *      all of the time...
3460          */
3461
3462 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3463         /*
3464          *      If there are no child threads, then there may
3465          *      be child processes.  In that case, wait for
3466          *      their exit status, and throw that exit status
3467          *      away.  This helps get rid of zxombie children.
3468          */
3469         while (waitpid(-1, &argval, WNOHANG) > 0) {
3470                 /* do nothing */
3471         }
3472 #endif
3473
3474 }
3475
3476 /*
3477  *      Externally-visibly functions.
3478  */
3479 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3480 {
3481         rad_listen_t *this, *head = NULL;
3482
3483         if (el) return 0;
3484
3485         time(&fr_start_time);
3486
3487         el = fr_event_list_create(event_status);
3488         if (!el) return 0;
3489
3490         pl = fr_packet_list_create(0);
3491         if (!pl) return 0;      /* leak el */
3492
3493         request_num_counter = 0;
3494
3495 #ifdef WITH_PROXY
3496         if (mainconfig.proxy_requests) {
3497                 pthread_mutexattr_t attr;
3498
3499                 /*
3500                  *      Create the tree for managing proxied requests and
3501                  *      responses.
3502                  */
3503                 proxy_list = fr_packet_list_create(1);
3504                 if (!proxy_list) return 0;
3505
3506 #ifdef HAVE_PTHREAD_H
3507                 pthread_mutexattr_init(&attr);
3508
3509 #ifdef PTHREAD_MUTEX_RECURSIVE
3510                 if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) < 0) {
3511                         radlog(L_ERR, "FATAL: Failed to set type for proxy mutex: %s",
3512                                strerror(errno));
3513                         exit(1);
3514                 }
3515 #endif
3516
3517                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3518                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3519                                strerror(errno));
3520                         exit(1);
3521                 }
3522
3523                 pthread_mutexattr_destroy(&attr);
3524 #endif
3525         }
3526 #endif
3527
3528         /*
3529          *      Just before we spawn the child threads, force the log
3530          *      subsystem to re-open the log file for every write.
3531          */
3532         if (spawn_flag) force_log_reopen();
3533
3534 #ifdef HAVE_PTHREAD_H
3535 #ifndef __MINGW32__
3536         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3537 #else
3538         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3539 #endif
3540         /*
3541          *      Initialize the threads ONLY if we're spawning, AND
3542          *      we're running normally.
3543          */
3544         if (spawn_flag && !check_config &&
3545             (thread_pool_init(cs, &spawn_flag) < 0)) {
3546                 exit(1);
3547         }
3548 #endif
3549
3550         /*
3551          *      Move all of the thread calls to this file?
3552          *
3553          *      It may be best for the mutexes to be in this file...
3554          */
3555         have_children = spawn_flag;
3556
3557         if (check_config) {
3558                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3559                        mainconfig.name);
3560                 return 1;
3561         }
3562
3563 #ifdef WITH_SELF_PIPE
3564         /*
3565          *      Child threads need a pipe to signal us, as do the
3566          *      signal handlers.
3567          */
3568         if (pipe(self_pipe) < 0) {
3569                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3570                        strerror(errno));
3571                 exit(1);
3572         }
3573         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3574                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3575                        strerror(errno));
3576                 exit(1);
3577         }
3578         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3579                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3580                        strerror(errno));
3581                 exit(1);
3582         }
3583
3584         if (!fr_event_fd_insert(el, 0, self_pipe[0],
3585                                   event_signal_handler, el)) {
3586                 radlog(L_ERR, "Failed creating handler for signals");
3587                 exit(1);
3588         }
3589 #endif  /* WITH_SELF_PIPE */
3590
3591 #ifdef WITH_PROXY
3592         /*
3593          *      Mark the proxy Fd's as unused.
3594          */
3595         {
3596                 int i;
3597
3598                 for (i = 0; i < 32; i++) proxy_fds[i] = -1;
3599         }
3600 #endif
3601
3602        DEBUG("%s: #### Opening IP addresses and Ports ####",
3603                mainconfig.name);
3604
3605        /*
3606         *       The server temporarily switches to an unprivileged
3607         *       user very early in the bootstrapping process.
3608         *       However, some sockets MAY require privileged access
3609         *       (bind to device, or to port < 1024, or to raw
3610         *       sockets).  Those sockets need to call suid up/down
3611         *       themselves around the functions that need a privileged
3612         *       uid.
3613         */
3614         if (listen_init(cs, &head) < 0) {
3615                 _exit(1);
3616         }
3617
3618         /*
3619          *      At this point, no one has any business *ever* going
3620          *      back to root uid.
3621          */
3622         fr_suid_down_permanent();
3623
3624         /*
3625          *      Add all of the sockets to the event loop.
3626          */
3627         for (this = head;
3628              this != NULL;
3629              this = this->next) {
3630                 char buffer[256];
3631
3632                 this->print(this, buffer, sizeof(buffer));
3633
3634                 switch (this->type) {
3635 #ifdef WITH_DETAIL
3636                 case RAD_LISTEN_DETAIL:
3637                         DEBUG("Listening on %s", buffer);
3638
3639                         /*
3640                          *      Detail files are always known, and aren't
3641                          *      put into the socket event loop.
3642                          */
3643                         this->status = RAD_LISTEN_STATUS_KNOWN;
3644
3645                         /*
3646                          *      Set up the first poll interval.
3647                          */
3648                         event_poll_detail(this);
3649                         break;
3650 #endif
3651
3652 #ifdef WITH_PROXY
3653                 case RAD_LISTEN_PROXY:
3654                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
3655                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
3656
3657                         proxy_fds[this->fd & 0x1f] = this->fd;
3658                         proxy_listeners[this->fd & 0x1f] = this;
3659                         if (!fr_packet_list_socket_add(proxy_list,
3660                                                          this->fd)) {
3661                                 rad_assert(0 == 1);
3662                         }
3663                         /* FALL-THROUGH */
3664 #endif
3665
3666                 default:
3667                         break;
3668                 }
3669
3670                 event_new_fd(this);
3671         }
3672
3673         mainconfig.listen = head;
3674
3675         return 1;
3676 }
3677
3678
3679 static int request_hash_cb(UNUSED void *ctx, void *data)
3680 {
3681         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
3682
3683 #ifdef WITH_PROXY
3684         rad_assert(request->in_proxy_hash == FALSE);
3685 #endif
3686
3687         ev_request_free(&request);
3688
3689         return 0;
3690 }
3691
3692
3693 #ifdef WITH_PROXY
3694 static int proxy_hash_cb(UNUSED void *ctx, void *data)
3695 {
3696         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
3697
3698         ev_request_free(&request);
3699
3700         return 0;
3701 }
3702 #endif
3703
3704 void radius_event_free(void)
3705 {
3706         /*
3707          *      FIXME: Stop all threads, or at least check that
3708          *      they're all waiting on the semaphore, and the queues
3709          *      are empty.
3710          */
3711
3712 #ifdef WITH_PROXY
3713         /*
3714          *      There are requests in the proxy hash that aren't
3715          *      referenced from anywhere else.  Remove them first.
3716          */
3717         if (proxy_list) {
3718                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3719                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
3720                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3721                 fr_packet_list_free(proxy_list);
3722                 proxy_list = NULL;
3723         }
3724 #endif
3725
3726         fr_packet_list_walk(pl, NULL, request_hash_cb);
3727
3728         fr_packet_list_free(pl);
3729         pl = NULL;
3730
3731         fr_event_list_free(el);
3732 }
3733
3734 int radius_event_process(void)
3735 {
3736         if (!el) return 0;
3737
3738         return fr_event_loop(el);
3739 }
3740
3741 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
3742 {
3743         request->options = RAD_REQUEST_OPTION_DEBUG2;
3744
3745         if (request_pre_handler(request)) {
3746                 rad_assert(fun != NULL);
3747                 rad_assert(request != NULL);
3748
3749                 if (request->server) RDEBUG("server %s {",
3750                                             request->server != NULL ?
3751                                             request->server : "");
3752                 fun(request);
3753
3754                 if (request->server) RDEBUG("} # server %s",
3755                                              request->server != NULL ?
3756                                             request->server : "");
3757
3758                 request_post_handler(request);
3759         }
3760
3761         DEBUG2("Going to the next request");
3762         return;
3763 }